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A013100
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cosh(arcsinh(x)+tan(x))=1+4/2!*x^2+24/4!*x^4+534/6!*x^6+16520/8!*x^8...
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1, 4, 24, 534, 16520, 1017914, 66612612, 8612481206, 839464647792, 223263066398386, 20349154329810172, 15355587487339427086, -408311328299061735320, 2681720930486026740373066, -832148640269649203971185996, 1101363338244005265784426750566
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) ~ (-1)^(n+1) * 2^(2*n) * n^(2*n-1) * cos(tanh(1)) / exp(2*n). - Vaclav Kotesovec, Nov 01 2013
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MATHEMATICA
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With[{nn=40}, Take[CoefficientList[Series[Cosh[ArcSinh[x]+Tan[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Feb 23 2013 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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EXTENSIONS
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STATUS
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approved
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