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%I #8 Apr 02 2017 14:43:35
%S 0,1,-2,-21,668,-8363,-597350,76652415,-5349200200,94006240681,
%T 53961261562294,-13137846911653101,1863043894828247636,
%U -101535637135541768963,-32156707726436068717742
%N Expansion of tan(tanh(x))*sin(x)/2.
%t Tan[ Tanh[ x ] ]*Sin[ x ]/2 (* Even Part *)
%Y Cf. A009717.
%K sign
%O 0,3
%A _R. H. Hardin_
%E Extended with signs Mar 1997