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

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =30a(5) =150a(6) =900a(7) =6300a(8) =51660a(9) =464940a(10) =4649400a(11) =51143400a(12) =614968200a(13) =7994586600a(14) =111924212400