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A013125 Expansion of E.g.f.: tanh(tanh(x)+log(x+1))=2*x-1/2!*x^2-16/3!*x^3+42/4!*x^4+492/5!*x^5... 0
0, 2, -1, -16, 42, 492, -3210, -30168, 404264, 2783952, -75206520, -292604288, 19217701008, 3111794272, -6389076941520, 29520888356032, 2643629755167360, -29037077579992832, -1307061634619873664 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..18.

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Tanh[Tanh[x]+Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 27 2018 *)

CROSSREFS

Sequence in context: A290315 A113108 A162005 * A012967 A013121 A012963

Adjacent sequences:  A013122 A013123 A013124 * A013126 A013127 A013128

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

EXTENSIONS

Zero prepended and definition clarified by Harvey P. Dale, May 27 2018

STATUS

approved

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Last modified October 15 16:30 EDT 2018. Contains 316236 sequences. (Running on oeis4.)