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URL: https://oeis.org/A293629

⇱ A293629 - OEIS

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A293629
Expansion of Product_{k>0} ((1 - q^(3*k))^4*(1 - q^(6*k))^2)/((1 - q^k)^4*(1 - q^(2*k))^2).
3
1, 4, 16, 44, 122, 288, 672, 1432, 3005, 5960, 11632, 21836, 40376, 72568, 128640, 223112, 382192, 643404, 1071152, 1757968, 2856482, 4586000, 7296768, 11490912, 17949404, 27787684, 42702576, 65106188, 98599604, 148274760, 221611776, 329127848, 486057756
OFFSET
0,2
LINKS
FORMULA
a(n) = (1/3) * A293569(3*n+2).
a(n) ~ 5^(1/4) * exp(2*Pi*sqrt(5*n)/3) / (2 * 3^(14/4)* n^(3/4)). - Vaclav Kotesovec, Oct 15 2017
MATHEMATICA
nmax = 50; CoefficientList[Series[Product[(1-x^(3*k))^4 * (1-x^(6*k))^2 / ((1-x^k)^4 * (1-x^(2*k))^2), {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Oct 15 2017 *)
CROSSREFS
Cf. A293569.
Sequence in context: A018210 A054498 A360278 * A217553 A225379 A359073
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Oct 13 2017
STATUS
approved