A024281 Expansion of sin(tan(x)^2)/2.

0, 1, 8, 76, -2752, -553904, -77878912, -11370511424, -1778864822272, -282582967817984, -36606453394757632, 2075368674171759616, 5791517230149348343808, 4398620127304280971595776

Offset: 0

Author

R. H. Hardin

Keywords

• sign

Crossrefs

Cf. A009518.

Programs

Mathematica

With[{nn=30},Take[CoefficientList[Series[Sin[Tan[x]^2]/2,{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* Harvey P. Dale, Feb 12 2016 *)

Extensions

Extended with signs Mar 1997

Prior Mathematica program replaced by Harvey P. Dale, Feb 12 2016