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Expansion of sin(x)*sin(tanh(x))/2.
0

%I #12 Apr 02 2017 15:36:02

%S 0,1,-8,144,-4960,270592,-21137408,2224725888,-302627860480,

%T 51593676611584,-10764002330353664,2695943436451381248,

%U -797890777835475828736,275364493447731494551552,-109570026970391274539712512,49780238650264282725443174400

%N Expansion of sin(x)*sin(tanh(x))/2.

%t With[{nn=30},Take[CoefficientList[Series[Sin[x]*Sin[Tanh[x]]/2,{x,0,nn}],x]Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Sep 24 2012 *)

%Y Cf. A009549.

%K sign

%O 0,3

%A _R. H. Hardin_

%E Extended with signs Mar 1997

%E Two more terms (a(14) & a(15)) from _Harvey P. Dale_, Sep 24 2012