E.g.f. (1-x)/(1-x-x^3-x^4+x^5).

Terms

a(0) =1a(1) =0a(2) =0a(3) =6a(4) =48a(5) =120a(6) =1440a(7) =25200a(8) =282240a(9) =2903040a(10) =50803200a(11) =958003200a(12) =16286054400a(13) =305124019200