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A009432
Expansion of e.g.f. log(1+x)/cosh(sinh(x)).
2
0, 1, -1, -1, 0, 9, -45, 447, -2744, 17553, -171585, 1757535, -19723176, 245370969, -3189613245, 44636677407, -674857335120, 10851333193249, -185485926579489, 3356664148618047, -64009236131219760, 1284480775318317225
OFFSET
0,6
LINKS
MATHEMATICA
With[{m=30}, CoefficientList[Series[Log[1+x]/Cosh[Sinh[x]], {x, 0, m}], x]*Range[0, m]!] (* modified by G. C. Greubel, Sep 08 2023 *)
PROG
(Magma)
R<x>:=PowerSeriesRing(Rationals(), 30);
[0] cat Coefficients(R!(Laplace( Log(1+x)/Cosh(Sinh(x)) ))); // G. C. Greubel, Sep 08 2023
(SageMath)
def A009432_list(prec):
P.<x> = PowerSeriesRing(QQ, prec)
return P( log(1+x)/cosh(sinh(x)) ).egf_to_ogf().list()
A009432_list(31) # G. C. Greubel, Sep 08 2023
CROSSREFS
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved