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A009156
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Expansion of e.g.f.: cosh(tan(log(1+x))).
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0
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1, 0, 1, -3, 20, -140, 1216, -12096, 137080, -1737504, 24368656, -374527120, 6259083896, -112992788688, 2191121957480, -45420491782680, 1002232901602496, -23453004823018496, 580102806342112960
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OFFSET
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0,4
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LINKS
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[Cosh[Tan[Log[1+x]]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Dec 15 2014 *)
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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EXTENSIONS
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Definition clarified and prior Mathematica program replaced by Harvey P. Dale, Dec 15 2014
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STATUS
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approved
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