A024266 Expansion of tanh(x)*tan(tan(x))/2.

0, 1, 4, 184, 8256, 791552, 99776000, 18222789632, 4310149906432, 1310908146057216, 493677023283642368, 226366154168309645312, 123958777998669625950208, 79952265836019615061245952

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