OFFSET
0,4
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
KEYWORD
sign
AUTHOR
Seiichi Manyama, Oct 11 2017
STATUS
approved