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A012596 exp(arcsinh(x)*sin(x))=1+2/2!*x^2+4/4!*x^4-40/6!*x^6-688/8!*x^8... 0

%I

%S 1,2,4,-40,-688,23968,-1134784,188393088,-40676275968,10688526352896,

%T -3523678949366784,1431294964438824960,-701609173130329731072,

%U 408385401482058726547456

%N exp(arcsinh(x)*sin(x))=1+2/2!*x^2+4/4!*x^4-40/6!*x^6-688/8!*x^8...

%F a(n) ~ (-1)^(n+1) * sinh(1) * 2^(2*n) * n^(2*n-1) / exp(2*n+Pi*sinh(1)/2). - _Vaclav Kotesovec_, Oct 31 2013

%t Table[n!*SeriesCoefficient[Exp[ArcSinh[x]*Sin[x]],{x,0,n}],{n,0,40,2}] (* _Vaclav Kotesovec_, Oct 31 2013 *)

%K sign

%O 0,2

%A Patrick Demichel (patrick.demichel(AT)hp.com)

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Last modified September 23 11:23 EDT 2020. Contains 337310 sequences. (Running on oeis4.)