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A009811 Expansion of tanh(tan(x))*sin(x). 1
0, 2, -4, -42, -456, 10154, 1263668, 74121726, 1582556016, -396499390126, -87145255604884, -10528569148387290, -379538283994219608, 201132350259244110074, 52827499211277672807332 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

MATHEMATICA

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

CROSSREFS

Sequence in context: A018312 A009547 A215921 * A009591 A009717 A018317

Adjacent sequences:  A009808 A009809 A009810 * A009812 A009813 A009814

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved

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Last modified December 3 11:49 EST 2020. Contains 338900 sequences. (Running on oeis4.)