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A024231 Expansion of tanh(tan(x))*sin(x)/2. 0
0, 1, -2, -21, -228, 5077, 631834, 37060863, 791278008, -198249695063, -43572627802442, -5264284574193645, -189769141997109804, 100566175129622055037, 26413749605638836403666 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

MATHEMATICA

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

CROSSREFS

Cf. A009811.

Sequence in context: A099748 A023812 A062813 * A069717 A036679 A134490

Adjacent sequences:  A024228 A024229 A024230 * A024232 A024233 A024234

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 1997

STATUS

approved

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Last modified June 17 22:17 EDT 2019. Contains 324200 sequences. (Running on oeis4.)