Expansion of e.g.f.: exp(exp(x) + x^2 - 1).

Terms

a(0) =1a(1) =1a(2) =4a(3) =11a(4) =51a(5) =212a(6) =1133a(7) =6001a(8) =36508a(9) =228435a(10) =1559575a(11) =11079180a(12) =83753497a(13) =659858617a(14) =5459331036a(15) =46980355355a(16) =421272977267