A245751 Number of identity trees with n nodes where the maximal outdegree (branching factor) equals 6.

3, 15, 70, 256, 884, 2840, 8788, 26238, 76511, 218462, 614003, 1702291, 4667792, 12678438, 34163511, 91424125, 243210889, 643652954, 1695711086, 4449529462, 11634279616, 30324707572, 78819222196, 204348623105, 528597552113, 1364545143938, 3515960193715

Offset: 20

Author

Joerg Arndt and Alois P. Heinz, Jul 31 2014

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 20..1000

Crossrefs

Column k=6 of A244523.

Programs

Maple

b:= proc(n, i, t, k) option remember; `if`(n=0, 1,
      `if`(i<1, 0, add(binomial(b(i-1$2, k$2), j)*
       b(n-i*j, i-1, t-j, k), j=0..min(t, n/i))))
    end:
a:= n-> b(n-1$2, 6$2) -b(n-1$2, 5$2):
seq(a(n), n=20..60);