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A024266 Expansion of tanh(x)*tan(tan(x))/2. 0
0, 1, 4, 184, 8256, 791552, 99776000, 18222789632, 4310149906432, 1310908146057216, 493677023283642368, 226366154168309645312, 123958777998669625950208, 79952265836019615061245952 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

Tanh[ x ]*Tan[ Tan[ x ] ]/2 (* Even Part *)

CROSSREFS

A009836.

Sequence in context: A295285 A322915 A221046 * A174772 A146549 A156905

Adjacent sequences:  A024263 A024264 A024265 * A024267 A024268 A024269

KEYWORD

nonn

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested 03/97.

STATUS

approved

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Last modified July 2 09:32 EDT 2022. Contains 354999 sequences. (Running on oeis4.)