E.g.f. 1/(1+sin(x)+sin(x)^2).

Terms

a(0) =1a(1) =-1a(2) =0a(3) =7a(4) =-24a(5) =-61a(6) =1200a(7) =-4493a(8) =-48384a(9) =781319a(10) =-1804800a(11) =-85444193a(12) =1210361856a(13) =1847527499a(14) =-288162201600