Expansion of e.g.f. 1/(1-x^3-x^4).

Terms

a(0) =1a(1) =0a(2) =0a(3) =6a(4) =24a(5) =0a(6) =720a(7) =10080a(8) =40320a(9) =362880a(10) =10886400a(11) =119750400a(12) =958003200a(13) =24908083200a(14) =523069747200