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A022621 Expansion of Product_{m>=1} (1+q^m)^(-26). 2
1, -26, 325, -2626, 15626, -74256, 298831, -1063426, 3447132, -10372882, 29340142, -78744042, 202029633, -498419898, 1187802148, -2744629914, 6168519890, -13520237380, 28964225680, -60763817556, 125042511217, -252773944748, 502601225828, -984061449124, 1899179853506 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..1000

FORMULA

a(n) ~ (-1)^n * 13^(1/4) * exp(Pi*sqrt(13*n/3)) / (2^(3/2) * 3^(1/4) * n^(3/4)). - Vaclav Kotesovec, Aug 27 2015

MATHEMATICA

nmax = 50; CoefficientList[Series[Product[1/(1 + x^k)^26, {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Aug 27 2015 *)

CROSSREFS

Sequence in context: A030647 A202292 A010942 * A085743 A205494 A125438

Adjacent sequences:  A022618 A022619 A022620 * A022622 A022623 A022624

KEYWORD

sign

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified January 17 10:21 EST 2022. Contains 350387 sequences. (Running on oeis4.)