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A244715 Number of compositions of n with exactly 3 transitions between different parts. 2
2, 10, 36, 86, 200, 374, 680, 1122, 1796, 2694, 3954, 5600, 7752, 10448, 13798, 18072, 23032, 29218, 36390, 45044, 54870, 66852, 79790, 95550, 112662, 132938, 154752, 180614, 207764, 239784, 273898, 312922, 354240, 401826, 451598, 508134, 567756, 634634, 705506 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,1

LINKS

Alois P. Heinz, Table of n, a(n) for n = 6..900

MAPLE

b:= proc(n, v) option remember; `if`(n=0, [1, 0$3],

      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..3][]]), i=1..n))

    end:

a:= n-> b(n, 0)[4]:

seq(a(n), n=6..60);

CROSSREFS

Column k=3 of A238279.

Sequence in context: A309889 A155894 A317454 * A212573 A100535 A206622

Adjacent sequences:  A244712 A244713 A244714 * A244716 A244717 A244718

KEYWORD

nonn

AUTHOR

Joerg Arndt and Alois P. Heinz, Jul 04 2014

STATUS

approved

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Last modified April 4 21:43 EDT 2020. Contains 333238 sequences. (Running on oeis4.)