Sequences

a(1) = a(2) = 1, a(n) = n - a(a(n-1)) - a(a(n-2)).

A binomial coefficient sum.

A binomial coefficient summation.

Denominators of Van der Pol numbers.

Numerators of Van der Pol numbers.

a(n) = floor(n/2) + 1 - d(n), where d(n) is the number of divisors of n.

Numbers whose square in base 2 is a palindrome.

Number of n-dimensional cuboids with integral edge lengths for which volume = surface area.

Number of blobs with 2n+1 edges.

Number of 2-line arrays; or number of P-graphs with 2n edges.

Number of 4 X n Latin rectangles in which the first row is in order.

Negated discriminants of orders of imaginary quadratic fields with 1 class per genus (a finite sequence).

Q(sqrt n) is a unique factorization domain (or simple quadratic field).

Heegner numbers: imaginary quadratic fields with unique factorization (or class number 1).

Positive integers D such that Q[sqrt(D)] is a quadratic field which is norm-Euclidean.

Almost certainly an erroneous version of A129427.

Integer part of 24(2^n-1)/n.

a(n) = ceiling(24(2^n-1)/n).

Number of indecomposable self-dual binary codes of length 2n.

Number of self-dual binary codes of length 2n (up to column permutation equivalence).

Number of equivalence classes of Boolean functions of n variables under action of symmetric group.

Number of P-equivalence classes of nondegenerate Boolean functions of n variables.

Dedekind numbers: inequivalent monotone Boolean functions of n or fewer variables, or antichains of subsets of an n-set.

Number of NPN-equivalence classes of unate Boolean functions of n or fewer variables.

Number of NP-equivalence classes of self-dual threshold functions of exactly n variables.

a(n) = (4*n+1)*(4*n+5).

Number of positive pseudo-threshold functions.

Number of positive threshold functions of n variables.

Decimal equivalent of Gray code for n.

Erroneous version of A051240.

Number of connected 2-plexes.

Number of symmetric Latin squares of order 2n with constant diagonal.

Length of uncrossed knight's path on an n X n board.

Magnetization for body-centered cubic lattice.

Susceptibility series for b.c.c. lattice.

Susceptibility series for diamond.

Magnetization series for face-centered cubic lattice.

Cluster series for bond percolation problem on hexagonal lattice.

Cluster series for bond percolation problem on square lattice.

Cluster series for bond percolation problem on honeycomb.

Cluster series for site percolation problem on honeycomb matching lattice (honeycomb structure with 1st, 2nd and 3rd neighbors connected).

Cluster series for site percolation problem on square matching lattice (square lattice with 1st and 2nd neighbors connected).

Cluster series for hexagonal lattice.

Cluster series for square lattice.

Cluster series for honeycomb.

Cluster series for bond percolation problem on f.c.c. lattice.

Cluster series for bond percolation problem on b.c.c. lattice.

Cluster series for bond percolation problem on cubic lattice.

Cluster series for bond percolation problem on diamond.

Cluster series for f.c.c. lattice.