E.g.f. satisfies: A(x,y) = exp(x*y*exp(x*A(x,y))).

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =1a(6) =0a(7) =3a(8) =12a(9) =1a(10) =0a(11) =4a(12) =72a(13) =48a(14) =1a(15) =0a(16) =5a(17) =320a(18) =810a(19) =160a(20) =1a(21) =0a(22) =6a(23) =1200a(24) =8640a(25) =6480a(26) =480a(27) =1a(28) =0a(29) =7