E.g.f.: exp(x^2/(1 - x^3)).

Terms

a(0) =1a(1) =0a(2) =2a(3) =0a(4) =12a(5) =120a(6) =120a(7) =5040a(8) =42000a(9) =181440a(10) =5473440a(11) =46569600a(12) =479666880a(13) =12713500800a(14) =123519876480