E.g.f. satisfies A(x)^A(x) = 1/(1 - x)^(x^3/6).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =4a(5) =10a(6) =40a(7) =210a(8) =784a(9) =5040a(10) =40200a(11) =369600a(12) =5285280a(13) =72072000a(14) =1006889520a(15) =14760345600a(16) =210510263040