Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #11 Jun 10 2022 09:22:21
%S 0,1,-6,59,-908,18677,-487186,15884591,-629675288,29536549353,
%T -1613063972382,101389361542691,-7251646333534372,584069408536408797,
%U -52535046765694820650,5240820278389450723095,-576261065508176155275824
%N Expansion of sin(x)*sin(sin(x))/2.
%t With[{nn=40},Take[CoefficientList[Series[Sin[x]*Sin[Sin[x]]/2,{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Jun 10 2022 *)
%Y Cf. A009546.
%K sign
%O 0,3
%A _R. H. Hardin_
%E Extended with signs Mar 1997
%E Previous Mathematica program replaced by _Harvey P. Dale_, Jun 10 2022