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%I A013190 #8 Nov 01 2013 18:48:29
%S A013190 0,1,0,-2,8,-12,-48,432,-2112,10000,14080,-1500512,17517568,-18269760,
%T A013190 -1666201600,16350361856,-45064462336,922523568384,-4131436888064,
%U A013190 -990634832194048,21402743134224384,92553699220882432
%N A013190 log(cosh(x)+arcsinh(x))=x-2/3!*x^3+8/4!*x^4-12/5!*x^5-48/6!*x^6...
%F A013190 a(n) ~ 2*n^(n-1) * exp(-n) * (2*Pi*cos(n*Pi/2) + 4*cos(1)*sin(n*Pi/2)) / (2+Pi^2+2*cos(2)). - _Vaclav Kotesovec_, Nov 01 2013
%t A013190 CoefficientList[Series[Log[Cosh[x]+ArcSinh[x]], {x, 0, 20}], x]* Range[0, 20]! (* _Vaclav Kotesovec_, Nov 01 2013 *)
%K A013190 sign
%O A013190 0,4
%A A013190 Patrick Demichel (patrick.demichel(AT)hp.com)
%E A013190 Prepended missing a(0)=0 from _Vaclav Kotesovec_, Nov 01 2013

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