E.g.f. satisfies A(x)^A(x) = 1/(1 - x)^(x^2).

Terms

a(0) =1a(1) =0a(2) =0a(3) =6a(4) =12a(5) =40a(6) =-180a(7) =-1512a(8) =-11760a(9) =142560a(10) =2701440a(11) =37033920a(12) =-47472480a(13) =-7299227520a(14) =-181704466944a(15) =-904179830400