A262948 Expansion of Product_{k>=1} (1 + x^(3*k-1))^(3*k-1).

1, 0, 2, 0, 1, 5, 0, 10, 8, 5, 26, 11, 28, 62, 24, 101, 111, 77, 260, 202, 268, 583, 382, 761, 1165, 847, 1940, 2198, 2061, 4346, 4084, 5078, 9039, 7844, 11978, 17620, 15721, 26648, 33219, 32894, 56000, 61494, 69653, 111884, 114265, 146557, 214864, 214967

Offset

0,3

Links

Alois P. Heinz, Table of n, a(n) for n = 0..10000

Formula

a(n) ~ exp(3 * 2^(-4/3) * Zeta(3)^(1/3) * n^(2/3)) * Zeta(3)^(1/6) / (2^(7/12) * sqrt(3*Pi) * n^(2/3)).

Mathematica

nmax=60; CoefficientList[Series[Product[(1 + x^(3*k-1))^(3*k-1), {k, 1, nmax}], {x, 0, nmax}], x]

Crossrefs

Cf. A262736, A262878, A262884, A262924, A262928, A262949.

Sequence in context: A092583 A321619 A285212 * A193471 A351645 A182931

Adjacent sequences: A262945 A262946 A262947 * A262949 A262950 A262951

Keyword

nonn

Author

Vaclav Kotesovec, Oct 05 2015

Status

approved