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A009788 Expansion of e.g.f.: tanh(log(1+x)/exp(x)). 0
0, 1, -3, 6, 12, -325, 3275, -21238, 2128, 2873229, -59980543, 767451894, -4032383300, -119489497257, 4880007568319, -104393287284518, 1240478290057792, 10284007879438201, -1108679036024621403, 37101253954089817798 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..19.

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Tanh[Log[1+x]/Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Sep 27 2014 *)

CROSSREFS

Sequence in context: A301522 A139416 A013563 * A102966 A309719 A332365

Adjacent sequences:  A009785 A009786 A009787 * A009789 A009790 A009791

KEYWORD

sign,easy

AUTHOR

R. H. Hardin

EXTENSIONS

Definition clarified by and prior Mathematica program replaced by Harvey P. Dale, Sep 27 2014

STATUS

approved

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Last modified January 20 21:49 EST 2021. Contains 340332 sequences. (Running on oeis4.)