%I #13 Mar 12 2013 07:49:03
%S 0,1,0,11,140,2701,257730,5851691,1344070520,73317675481,
%T 17125877112510,2314602290490071,496897093852087700,
%U 132852776453477111461,31592203753748083380090,12724021149804296273555651,3989248533415441473207453680,1975896027212299978047797438641
%N E.g.f.: log(1+tan(x)*sinh(x))/2 (even powers only).
%e log(1+tan(x)*sinh(x))/2 = 0 + 1/2!*x^2 + 0/4!*x^4 + 11/6!*x^6 + 140/8!*x^8 + ...
%t With[{nn=40},Take[CoefficientList[Series[Log[1+Tan[x]Sinh[x]]/2,{x,0,nn}],x]Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Mar 11 2013 *)
%Y A009378.
%K nonn
%O 0,4
%A _R. H. Hardin_
%E Extended and signs tested 03/97.
%E More terms from _Harvey P. Dale_, Mar 11 2013