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%I #6 Jul 20 2021 18:57:53
%S 2,8,306,30312,5993442,1954414728,953905703058,650409090147432,
%T 590608999475062722,688945370061378414600,1003968219388341434081778,
%U 1787361481981953243947889000,3817161109431432209134714003362
%N arcsin(arcsinh(x)+arcsin(x))=2*x+8/3!*x^3+306/5!*x^5+30312/7!*x^7...
%t With[{nn=30},Take[CoefficientList[Series[ArcSin[ArcSinh[x]+ArcSin[x]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Jul 20 2021 *)
%K nonn
%O 0,1
%A Patrick Demichel (patrick.demichel(AT)hp.com)