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%I #9 Apr 02 2017 15:23:01
%S 0,1,4,-12,-2272,-166960,-13136448,-1177426880,-116571720704,
%T -11452654888704,-669616618900480,214088681811547136,
%U 155062926684742508544,76744341986122463531008,36379718195920790292840448
%N Expansion of sin(tan(x)*x)/2.
%t Sin[ Tan[ x ]*x ]/2 (* Even Part *)
%Y Cf. A009515.
%K sign
%O 0,3
%A _R. H. Hardin_
%E Extended with signs Mar 1997
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