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A293532 E.g.f.: exp(x/(x^2 - 1)). 5
1, -1, 1, -7, 25, -181, 1201, -10291, 97777, -1013545, 12202561, -151573951, 2173233481, -31758579997, 524057015665, -8838296029291, 164416415570401, -3145357419120721, 65057767274601217, -1391243470549894135, 31671795881695430521, -747996624368605997701 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..21.

FORMULA

E.g.f.: Product_{k>=1} 1/(1 + x^k)^(phi(k)/k), where phi() is the Euler totient function (A000010). - Ilya Gutkovskiy, May 25 2019

MATHEMATICA

CoefficientList[Series[E^(x/(x^2 - 1)), {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Oct 12 2017 *)

PROG

(PARI) N=66; x='x+O('x^N); Vec(serlaplace(exp(x/(x^2-1))))

CROSSREFS

Column k=2 of A293530.

Cf. A088009.

Sequence in context: A208425 A191237 A088009 * A208823 A197913 A215058

Adjacent sequences:  A293529 A293530 A293531 * A293533 A293534 A293535

KEYWORD

sign

AUTHOR

Seiichi Manyama, Oct 11 2017

STATUS

approved

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Last modified September 15 14:38 EDT 2019. Contains 327078 sequences. (Running on oeis4.)