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%I #14 Jun 22 2015 22:42:35
%S 0,1,-1,-2,14,-14,-286,1828,3464,-130664,619304,7421008,-128214736,
%T 153779536,18052524944,-209102239712,-1370716606336,63200892286336,
%U -414519986847616,-12766540334296832,303340786629265664
%N Expansion of e.g.f.: tanh(log(1+tanh(x))).
%t With[{nn=30},CoefficientList[Series[Tanh[Log[1+Tanh[x]]],{x,0,nn}],x]Range[0,nn]!] (* _Harvey P. Dale_, Aug 17 2012 *)
%K sign,easy
%O 0,4
%A _R. H. Hardin_
%E Extended with signs by _Olivier Gérard_, Mar 15 1997
%E Definition clarified by _Harvey P. Dale_, Aug 17 2012