Expansion of e.g.f. 1/(1 - x * exp(-x * exp(-x))).

Terms

a(0) =1a(1) =1a(2) =0a(3) =3a(4) =8a(5) =-15a(6) =264a(7) =-35a(8) =-1968a(9) =87633a(10) =-499600a(11) =2375901a(12) =48964200a(13) =-830424023a(14) =9884072184a(15) =-11730111315