Sequences

Number of self-complementary Boolean functions of n variables: see Comments for precise definition.

Number of normalized Latin squares of order n containing no 2 X 2 Latin subsquare.

Number of P-equivalence classes of switching functions of n or fewer variables, divided by 2.

Number of Boolean functions of n variables.

Number of complemented types of Boolean functions of n variables under action of AG(n,2).

Threshold functions of exactly n variables.

a(-1)=1 by convention; for n >= 0, a(n) = number of irreducible Boolean functions of n variables.

Number of NP-equivalence classes of threshold functions of n or fewer variables.

Number of nondegenerate Boolean functions of n variables: For n > 0, a(n) = A000616(n) - A000616(n-1).

NP-equivalence classes of threshold functions of exactly n variables.

Number of monosubstituted alkanes C(n-1)H(2n-1)-X with n-1 carbon atoms that are stereoisomers.

Number of monosubstituted alkanes C(n-1)H(2n-1)-X with n-1 carbon atoms that are not stereoisomers.

Number of monosubstituted alkanes C(n)H(2n+1)-X of the form shown in the Comments lines that are stereoisomers.

Number of monosubstituted alkanes C(n)H(2n+1)-X of the form shown in the Comments lines that are stereoisomers.

Number of monosubstituted alkanes C(n)H(2n+1)-X of the form shown in the Comments lines that are not stereoisomers.

Number of n-node steric rooted ternary trees; number of n carbon alkyl radicals C(n)H(2n+1) taking stereoisomers into account.

Number of stereoisomeric paraffins with n carbon atoms.

Number of non-stereoisomeric paraffins with n carbon atoms.

Number of n-node unrooted steric quartic trees; number of n-carbon alkanes C(n)H(2n+2) taking stereoisomers into account.

Number of necklaces of partitions of n+1 labeled beads.

Number of ways to represent n using the binary operator a * b = 2^a + b.

Number of ethylene derivatives with n carbon atoms.

Number of esters with n carbon atoms up to structural isomerism.

Number of acyclic quaternary ammonium ions with n carbon atoms.

Number of glycols with n carbon atoms.

Number of paraffins C_n H_{2n} X Y with n carbon atoms.

Number of paraffins C_n H_{2n} X_2 with n carbon atoms.

Number of fixed-point-free permutation groups of degree n.

Number of permutation groups of degree n; also number of conjugacy classes of subgroups of symmetric group S_n; also number of molecular species of degree n.

Number of alkyl benzenes with n carbon atoms: C(n)H(2n-6).

Number of paraffins C_n H_{2n-1} XYZ with n carbon atoms.

Number of paraffins C_n H_{2n-1} X_3 with n carbon atoms.

a(1)=0; for n>1, a(n) = number of isomeric hydrocarbons of the acetylene series with carbon content n.

a(n) = a(n-1) + 2^a(n-2).

Number of loops of length 4n on square grid that turn at each step and return to start in original direction.

Number of alkyls X^{II} C_n H_{2n+1} Y with n carbon atoms.

Number of alkyls Y^{II} C_n H_{2n+2} with n carbon atoms.

Alkyl naphthalenes C_{n+10} H_{2n+8} with n+10 carbon atoms.

Number of alkyls C_{n+15} H_{2n+10} (Anthr.) with n carbon atoms.

Number of alkyls C_{n+15} H_{2n+10} (Phenan) with n carbon atoms.

Number of alkyls S C_{n+4} H_{2n+4} with n carbon atoms.

Running time of Takeuchi function.

Invertible Boolean functions of n variables.

Invertible Boolean functions of n variables.

Invertible Boolean functions of n variables.

a(n) = number of letters in a(n-1), a(1) = 1 (in English).

Invertible Boolean functions of n variables with S(n) acting on the domain and GL(n,2) acting on the range.

Median Euler numbers (the middle numbers of Arnold's shuttle triangle).

Strehl's sequence "C_n^(3)".

a(n) = 2^a(n-1) + a(n-2).