A024238 Expansion of sinh(sin(x)*x)/2.

0, 1, -2, 63, -1684, 47885, -2204406, 132744619, -9077359208, 742552576857, -73321393543210, 8347807403373911, -1073637784611054972, 156252386332716624613, -25582992239831815086494

Offset

0,3

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Sinh[Sin[x]x]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Jan 15 2024 *)

Crossrefs

Cf. A009595.

Sequence in context: A262005 A296278 A239744 * A234279 A109667 A330059

Adjacent sequences: A024235 A024236 A024237 * A024239 A024240 A024241

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs Mar 1997

Previous Mathematica program replaced by Harvey P. Dale, Jan 15 2024

Status

approved