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A024281
Expansion of sin(tan(x)^2)/2.
1
0, 1, 8, 76, -2752, -553904, -77878912, -11370511424, -1778864822272, -282582967817984, -36606453394757632, 2075368674171759616, 5791517230149348343808, 4398620127304280971595776
OFFSET
0,3
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 *)
CROSSREFS
Cf. A009518.
Sequence in context: A233827 A231286 A251927 * A232087 A105429 A225348
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs Mar 1997
Prior Mathematica program replaced by Harvey P. Dale, Feb 12 2016
STATUS
approved