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

Terms

a(0) =1a(1) =0a(2) =0a(3) =6a(4) =0a(5) =0a(6) =360a(7) =2520a(8) =0a(9) =60480a(10) =1814400a(11) =13305600a(12) =19958400a(13) =1556755200a(14) =39956716800a(15) =337815878400