Expansion of e.g.f. sin( 2 * (exp(x) - 1) )/2.

Terms

a(0) =0a(1) =1a(2) =1a(3) =-3a(4) =-23a(5) =-83a(6) =-119a(7) =973a(8) =11145a(9) =69805a(10) =278281a(11) =33165a(12) =-12794231a(13) =-157150355a(14) =-1271714807a(15) =-7108146611a(16) =-11364216951a(17) =380051588653