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A244721 Number of compositions of n with exactly 9 transitions between different parts. 2
2, 28, 210, 1158, 5112, 19206, 63494, 189092, 516528, 1310128, 3119942, 7027866, 15082152, 30994832, 61292380, 117063670, 216690678, 389814504, 683256278, 1169346934, 1957831816, 3212249500, 5172450680, 8185057350, 12743907242, 19544000940, 29551096298 (list; graph; refs; listen; history; text; internal format)
OFFSET

15,1

LINKS

Alois P. Heinz, Table of n, a(n) for n = 15..900

MAPLE

b:= proc(n, v) option remember; `if`(n=0, [1, 0$9],

      add(`if`(v in [0, i], b(n-i, `if`(i<=n-i, i, -1)),

      [0, b(n-i, `if`(i<=n-i, i, -1))[1..9][]]), i=1..n))

    end:

a:= n-> b(n, 0)[10]:

seq(a(n), n=15..60);

CROSSREFS

Column k=9 of A238279.

Sequence in context: A123787 A035601 A281124 * A001759 A243475 A019441

Adjacent sequences:  A244718 A244719 A244720 * A244722 A244723 A244724

KEYWORD

nonn

AUTHOR

Joerg Arndt and Alois P. Heinz, Jul 04 2014

STATUS

approved

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Last modified October 15 01:40 EDT 2019. Contains 328025 sequences. (Running on oeis4.)