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A009718 Expansion of tan(tanh(x))*x. 1
0, 2, 0, -48, 896, -1280, -1317888, 113985536, -5662048256, -173996310528, 103038851481600, -18151624725757952, 1834297840675848192, 53334014587534573568, -66117477689491873333248 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..14.

MATHEMATICA

Tan[ Tanh[ x ] ]*x (* Even Part *)

CROSSREFS

Sequence in context: A326718 A097173 A009493 * A198799 A156501 A012420

Adjacent sequences:  A009715 A009716 A009717 * A009719 A009720 A009721

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved

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Last modified April 15 22:35 EDT 2021. Contains 343007 sequences. (Running on oeis4.)