E.g.f. satisfies A(x) = exp(x/A(x)^x).

Terms

a(0) =1a(1) =1a(2) =1a(3) =-5a(4) =-23a(5) =121a(6) =1321a(7) =-7349a(8) =-148175a(9) =853777a(10) =27840241a(11) =-163354949a(12) =-7934320679a(13) =46820981065