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A009822 Expansion of tanh(tanh(x)*exp(x)). 1
0, 1, 2, -1, -28, -123, 182, 7667, 54280, -145239, -7508758, -69740537, 300239084, 17444352109, 197525621022, -1252976775365, -79313336380656, -1042490265261103, 9235164337672658, 623118827676161167 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

MATHEMATICA

Tanh[ Tanh[ x ]*Exp[ x ] ]

With[{nn = 50}, CoefficientList[Series[Tanh[Tanh[x]Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Vincenzo Librandi, Apr 11 2014 *)

CROSSREFS

Sequence in context: A012415 A012660 A015155 * A246909 A249269 A245621

Adjacent sequences:  A009819 A009820 A009821 * A009823 A009824 A009825

KEYWORD

sign

AUTHOR

R. H. Hardin, Simon Plouffe

STATUS

approved

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Last modified May 25 13:00 EDT 2022. Contains 354071 sequences. (Running on oeis4.)