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A284628 Expansion of Product_{k>=1} 1/(1+x^(2*k-1))^(2*k-1). 9
1, -1, 1, -4, 4, -9, 15, -22, 37, -56, 92, -133, 210, -310, 466, -696, 1013, -1495, 2160, -3141, 4495, -6462, 9172, -13024, 18387, -25840, 36213, -50500, 70280, -97302, 134522, -185105, 254245, -347938, 475036, -646676, 878145, -1189468, 1607095, -2166672, 2913794 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..10000

FORMULA

a(n) = (-1)^n * A262811(n).

MATHEMATICA

nmax = 50; CoefficientList[Series[Product[1/(1+x^(2*k-1))^(2*k-1), {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Apr 15 2017 *)

CROSSREFS

Cf. A255528, A262736, A262811.

Sequence in context: A050218 A165996 A266008 * A262811 A294749 A098359

Adjacent sequences:  A284625 A284626 A284627 * A284629 A284630 A284631

KEYWORD

sign

AUTHOR

Seiichi Manyama, Apr 15 2017

STATUS

approved

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Last modified February 25 22:37 EST 2021. Contains 341618 sequences. (Running on oeis4.)