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A213297 Number of n-length words w over 9-ary alphabet such that 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, 9, 81, 621, 4293, 26061, 140517, 676155, 2990967, 12602451, 52359693, 216954441, 901911273, 3778512489, 16012113225, 68739345546, 299377174968, 1323228682218, 5939020708851, 27063683050245, 125241936884631, 588324477445971, 2805460966739493 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..22.

CROSSREFS

Column k=9 of A213276.

Sequence in context: A218268 A223882 A267961 * A272243 A272242 A206728

Adjacent sequences:  A213294 A213295 A213296 * A213298 A213299 A213300

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Jun 08 2012

STATUS

approved

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Last modified December 4 19:40 EST 2021. Contains 349526 sequences. (Running on oeis4.)