A245752 Number of identity trees with n nodes where the maximal outdegree (branching factor) equals 7.

3, 23, 114, 474, 1780, 6179, 20363, 64441, 197653, 591131, 1732165, 4989933, 14171244, 39760411, 110402589, 303808762, 829504935, 2249326273, 6062516975, 16252409052, 43361162336, 115191492778, 304834916107, 803891596292, 2113302899765, 5539657831304

Offset: 25

Author

Joerg Arndt and Alois P. Heinz, Jul 31 2014

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 25..800

Crossrefs

Column k=7 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, 7$2) -b(n-1$2, 6$2):
seq(a(n), n=25..60);