Expansion of e.g.f. 1 / (1 - x + x^2/2 - x^3/3 + x^4/4).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =-10a(6) =-130a(7) =-840a(8) =-5880a(9) =-36960a(10) =-142800a(11) =184800a(12) =12843600a(13) =229429200a(14) =3035432400a(15) =31615584000a(16) =258306048000a(17) =943422480000