A213867 - OEIS

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A213867

Number of words w where each letter of the n-ary alphabet occurs 7 times and for every prefix z of w we have #(z,a_i) = 0 or #(z,a_i) >= #(z,a_j) for all j>i and #(z,a_i) counts the occurrences of the i-th letter in z.

1, 1, 561, 2914395, 54862627919, 2468722942369153, 211109968702038259993, 29745278219128813035415595, 6273648300104128965616586081511, 1850042480471503379038420801262526759, 725168149513389307543056971716033431701831

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..10.

EXAMPLE

a(0) = 1: the empty word.

a(1) = 1: aaaaaaa.

a(2) = 561: aaaaaaabbbbbbb, aaaaaababbbbbb, ..., baababababaabb, baabababababab.

CROSSREFS

Row n=7 of A213275.

Sequence in context: A290497 A258839 A371759 * A139089 A202562 A252352

Adjacent sequences: A213864 A213865 A213866 * A213868 A213869 A213870

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Jun 23 2012

STATUS

approved