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A244538 Number of ordered 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, 9, 19, 20, 21, 22, 23, 24, 25, 26, 144, 406, 841, 1335, 1891, 2512, 3201, 3961, 4795, 7491, 14467, 28861, 54626, 94160, 150101, 225337, 323016, 446556, 629454, 949486, 1545877, 2639756, 4558225, 7716325, 12629776, 19928727, 30372551 (list; graph; refs; listen; history; text; internal format)
OFFSET

10,10

LINKS

Alois P. Heinz, Table of n, a(n) for n = 10..1000

MAPLE

b:= proc(n, t, k) option remember; `if`(n=0,

      `if`(t in [0, k], 1, 0), `if`(t>n, 0, add(b(j-1, k$2)*

       b(n-j, max(0, t-1), k), j=1..n)))

    end:

a:= n-> b(n-1, 9$2) -b(n-1, 10$2):

seq(a(n), n=10..60);

CROSSREFS

Column k=9 of A244530.

Cf. A244463.

Sequence in context: A107780 A288392 A157140 * A242332 A075981 A079368

Adjacent sequences:  A244535 A244536 A244537 * A244539 A244540 A244541

KEYWORD

nonn

AUTHOR

Joerg Arndt and Alois P. Heinz, Jun 29 2014

STATUS

approved

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Last modified July 14 09:22 EDT 2020. Contains 335720 sequences. (Running on oeis4.)