A038061 a(n) = 3^n*n^(n-1).

3, 18, 243, 5184, 151875, 5668704, 257298363, 13759414272, 847288609443, 59049000000000, 4594736955793347, 394865111526801408, 37144672966729275363, 3796313155316599873536, 418886580596209716796875

Offset: 1

Author

Christian G. Bower, Jan 04 1999

Keywords

• nonn

Comments

Labeled rooted trees with 3-colored nodes.

Links

• Index entries for sequences related to rooted trees

Crossrefs

Cf. A000169, A038055-A038062.

Programs

Maple

A038061:=n->3^n*n^(n-1): seq(A038061(n), n=1..20); # Wesley Ivan Hurt, Feb 13 2017

Mathematica

Table[3^n n^(n-1),{n,20}] (* Harvey P. Dale, Aug 24 2012 *)

Formula

E.g.f. B(3x) where B(x) is e.g.f. of A000169.

Extensions

New description from Vladeta Jovovic, Mar 08 2003