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A009020
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Expansion of e.g.f.: cos(log(1 + sinh(x))).
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1
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1, 0, -1, 3, -14, 70, -406, 2723, -20684, 176100, -1661236, 17182143, -193042904, 2335585330, -30176889016, 412862112263, -5925850093424, 88231921922760, -1341868300356496, 20329433614333083, -291715707804107744
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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[Cos[Log[1+Sinh[x]]], {x, 0, nn}], x] Range[ 0, nn]!] (* Harvey P. Dale, Apr 10 2014 *)
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PROG
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(PARI) x='x+O('x^30); Vec(serlaplace(cos(log(1 + sinh(x))))) \\ G. C. Greubel, Jul 22 2018
(Magma) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(Cos(Log(1 + Sinh(x))))); [Factorial(n-1)*b[n]: n in [1..m]]; // G. C. Greubel, Jul 22 2018
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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 Mathematica program replaced by Harvey P. Dale, Apr 10 2014
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STATUS
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approved
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