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A244463
Number of unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 9.
3
1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 4, 7, 12, 16, 21, 25, 30, 34, 39, 47, 61, 83, 117, 160, 215, 280, 356, 442, 549, 682, 864, 1112, 1458, 1919, 2533, 3313, 4298, 5521, 7057, 8995, 11497, 14751, 19042, 24687, 32102, 41731, 54172, 70112, 90535
OFFSET
10,11
LINKS
MAPLE
b:= proc(n, i, t, k) option remember; `if`(n=0, `if`(t in [0, k],
1, 0), `if`(i<1 or t>n, 0, add(binomial(b((i-1)$2, k$2)+j-1, j)*
b(n-i*j, i-1, max(0, t-j), k), j=0..n/i)))
end:
a:= n-> b(n-1$2, 9$2) -b(n-1$2, 10$2):
seq(a(n), n=10..75);
CROSSREFS
Column k=9 of A244454.
Cf. A244538.
Sequence in context: A248774 A104274 A008857 * A307590 A307987 A047935
KEYWORD
nonn
AUTHOR
Joerg Arndt and Alois P. Heinz, Jun 29 2014
STATUS
approved