A024243 Expansion of tanh(sin(x)*x)/2.

0, 1, -2, -117, 3356, 176405, -25528806, -511975457, 554197425592, -35655181253847, -25582284242683210, 6598119430000033331, 1878722559559319754708, -1478103068989901067214787, -77274866172665629115051054

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 A379549 A147774

Adjacent sequences: A024240 A024241 A024242 * A024244 A024245 A024246

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs Mar 1997

Status

approved