A009489 Expansion of sin(sinh(tan(x))).

1, 2, 8, -344, -44416, -5130368, -688030080, -109875416832, -20650894622720, -4460981432725504, -1069938200055119872, -268541150093198032896, -60666450534816002965504, -3605301387144067469213696

Offset

0,2

Links

Robert Israel, Table of n, a(n) for n = 0..234

Formula

sin(sinh(tan(x))) = Sum_{n>=0} a(n)*x^(2*n+1)/(2*n+1)!. - Robert Israel, Nov 23 2016

Maple

S:= series(sin(sinh(tan(x))), x, 51):
seq(coeff(S, x, j)*j!, j=1..49, 2); # Robert Israel, Nov 23 2016

Mathematica

Sin[ Sinh[ Tan[ x ] ] ] (* Odd Part *)
Take[Table[n!*SeriesCoefficient[Sin[Sinh[Tan[x]]], {x, 0, n}], {n, 0, 15}], {2, -1, 2}] (* G. C. Greubel, Nov 23 2016 *)

Crossrefs

Sequence in context: A009707 A013176 A220904 * A102597 A009836 A012342

Adjacent sequences: A009486 A009487 A009488 * A009490 A009491 A009492

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved