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A024243 Expansion of tanh(sin(x)*x)/2. 1
0, 1, -2, -117, 3356, 176405, -25528806, -511975457, 554197425592, -35655181253847, -25582284242683210, 6598119430000033331, 1878722559559319754708, -1478103068989901067214787, -77274866172665629115051054 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

MATHEMATICA

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

CROSSREFS

Cf. A009800.

Sequence in context: A203607 A188977 A042681 * A307094 A147774 A013470

Adjacent sequences:  A024240 A024241 A024242 * A024244 A024245 A024246

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs Mar 1997

STATUS

approved

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Last modified July 17 02:10 EDT 2019. Contains 325092 sequences. (Running on oeis4.)