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A024287 Expansion of sinh(tan(x)^2)/2. 1
0, 1, 8, 196, 10688, 937936, 113552768, 17875345216, 3555171842048, 875294104443136, 261970132442851328, 93711886717539460096, 39452759032211774455808, 19284289193322067327799296 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

MATHEMATICA

Sinh[ Tan[ x ]^2 ]/2 (* Even Part *)

CROSSREFS

A009613.

Sequence in context: A103500 A232911 A119299 * A208703 A304398 A020329

Adjacent sequences:  A024284 A024285 A024286 * A024288 A024289 A024290

KEYWORD

nonn

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested 03/97.

STATUS

approved

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Last modified February 15 22:28 EST 2019. Contains 320138 sequences. (Running on oeis4.)