131328

Appears in sequences

• a(n) = (2^n + 2^[ n/2 ] )/2.at n=16A001445
• Numbers that are the sum of 3 nonzero 8th powers.at n=17A003381
• a(n) = 2^(n-1)*(2^n - (-1)^n).at n=9A003674
• Numbers that are the sum of at most 3 nonzero 8th powers.at n=32A004876
• Number of (n-1)-bead black-white reversible strings; also binary grids; also row sums of Losanitsch's triangle A034851; also number of caterpillar graphs on n+2 vertices.at n=18A005418
• Nonperiodic autocorrelation functions of length n.at n=18A006606
• a(n) = 2^(n-1)*(1+2^n).at n=9A007582
• Theta series of lattice Kappa_8.at n=25A015235
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite DDR = Deca-dodecasil 3R[Si120O240]qR starting with a T5 atom.at n=15A019112
• Sum of every 4th entry of row n in Pascal's triangle, starting at "n choose 1".at n=19A038504
• Sum of every 4th entry of row n in Pascal's triangle, starting at binomial(n,2).at n=19A038505
• Number of elements of GF(2^n) with trace 0 and subtrace 1.at n=19A038519
• Number of elements of GF(2^n) with trace 1 and subtrace 0.at n=19A038520
• Number of self-complementary 2-plexes.at n=8A047660
• Number of undirected walks of length n+1 on an oriented triangle, visiting n+2 vertices, with n "corners"; the symmetry group is C3. Walks are not self-avoiding.at n=17A051437
• Number of self-complementary directed 3-multigraphs on n nodes.at n=4A052151
• Smallest triangular number that contains the string n in its exact center.at n=13A062690
• a(n) = (n^6 + n^3)/2.at n=8A071232
• Number of complete mappings f(x) of Z_{2n+1} such that -(-id+f)^(-1)=f.at n=13A071608
• Smallest triangular number with n prime factors (counted with multiplicity).at n=12A075088