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A024247
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Expansion of e.g.f. sinh(x)*sin(tan(x))/2, even powers only.
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1
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0, 1, 4, 4, -1152, -91888, -7570624, -730713664, -83226398720, -10970712254208, -1615807519095808, -249282435016526848, -33772384403350126592, -217538905379543379968, 3508702299226395880538112
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OFFSET
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0,3
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..100
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Sinh[x]Sin[Tan[x]]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Oct 24 2013 *)
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CROSSREFS
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Cf. A009627.
Sequence in context: A068556 A078243 A024246 * A067445 A167003 A335762
Adjacent sequences: A024244 A024245 A024246 * A024248 A024249 A024250
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KEYWORD
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sign
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AUTHOR
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R. H. Hardin
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EXTENSIONS
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Extended with signs by Olivier Gérard, Mar 15 1997
Prior Mathematica program replaced by Harvey P. Dale, Oct 24 2013
Clarified definition, Joerg Arndt, Feb 09 2014
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STATUS
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approved
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