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A245752 Number of identity trees with n nodes where the maximal outdegree (branching factor) equals 7. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

25,1

LINKS

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

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);

CROSSREFS

Column k=7 of A244523.

Sequence in context: A225671 A267816 A269235 * A290367 A006557 A226611

Adjacent sequences:  A245749 A245750 A245751 * A245753 A245754 A245755

KEYWORD

nonn

AUTHOR

Joerg Arndt and Alois P. Heinz, Jul 31 2014

STATUS

approved

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Last modified July 6 23:56 EDT 2020. Contains 335484 sequences. (Running on oeis4.)