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A012647
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sin(arcsinh(x)*sinh(x))=2/2!*x^2-80/6!*x^6-1344/8!*x^8+14848/10!*x^10...
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0
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0, 2, 0, -80, -1344, 14848, -478720, 233089792, -40950956032, 10897158856704, -3658314845569024, 1494490439452852224, -737151399778288664576, 431277629004040408989696, -295401420454303808123568128
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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) * cos(sin(1)*Pi/2) * sin(1) * 2^(2*n) * n^(2*n-1) / exp(2*n). - Vaclav Kotesovec, Nov 01 2013
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MATHEMATICA
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Table[n!*SeriesCoefficient[Sin[ArcSinh[x]*Sinh[x]], {x, 0, n}], {n, 0, 40, 2}] (* Vaclav Kotesovec, Nov 01 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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