Expansion of e.g.f. 1 / (1 + x - x * exp(x^3/6)).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =4a(5) =0a(6) =0a(7) =70a(8) =1120a(9) =0a(10) =2800a(11) =184800a(12) =2217600a(13) =200200a(14) =39239200a(15) =1513512000a(16) =16166550400a(17) =11435424000