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A012694
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exp(tanh(x)*arcsinh(x))=1+2/2!*x^2-50/6!*x^6+1400/8!*x^8-35222/10!*x^10...
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0
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1, 2, 0, -50, 1400, -35222, 94556, 170807390, -38605204656, 8791324177746, -2481630462515900, 912971947568647558, -429970979043182394888, 249025730862440011229306, -171416914808317798189712276
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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) * tan(1) * 2^(2*n) * n^(2*n-1) / exp(tan(1)*Pi/2 + 2*n). - Vaclav Kotesovec, Nov 01 2013
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MATHEMATICA
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Table[n!*SeriesCoefficient[Exp[Tanh[x]*ArcSinh[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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STATUS
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approved
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