E.g.f.: -LambertW(-x)/(1-x).

A277505

E.g.f.: -LambertW(-x)/(1-x).

Terms

    a(0) =0a(1) =1a(2) =4a(3) =21a(4) =148a(5) =1365a(6) =15966a(7) =229411a(8) =3932440a(9) =78438681a(10) =1784386810a(11) =45565679511

External references