Let T = Sum_{k >= 1} k^(k-1)*x^k be the g.f. for rooted labeled trees (A000169); sequence has g.f. T/(1-T).

A088342

Let T = Sum_{k >= 1} k^(k-1)*x^k be the g.f. for rooted labeled trees (A000169); sequence has g.f. T/(1-T).

Terms

    a(0) =1a(1) =3a(2) =14a(3) =93a(4) =837a(5) =9742a(6) =140449a(7) =2420297a(8) =48506250a(9) =1107465929a(10) =28354713349a(11) =804166591614

External references