O.g.f.: Sum_{n>=0} 1/(1-n*x)^n * x^n/n! * exp(-x/(1-n*x)).

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =4a(5) =13a(6) =46a(7) =181a(8) =778a(9) =3585a(10) =17566a(11) =91171a(12) =499324a(13) =2873839a(14) =17317743a(15) =108933098a(16) =713481122a(17) =4855161425a(18) =34257461754a(19) =250177938679