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