Expansion of e.g.f. (1-x^2)/(1-x^2-x^3).

Terms

a(0) =1a(1) =0a(2) =0a(3) =6a(4) =0a(5) =120a(6) =720a(7) =5040a(8) =80640a(9) =725760a(10) =10886400a(11) =159667200a(12) =2395008000a(13) =43589145600a(14) =784604620800