E.g.f.: exp(x^3/(1 - x^4)).

Terms

a(0) =1a(1) =0a(2) =0a(3) =6a(4) =0a(5) =0a(6) =360a(7) =5040a(8) =0a(9) =60480a(10) =3628800a(11) =39916800a(12) =19958400a(13) =3113510400a(14) =130767436800