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A321843 Number of words w of length n such that each letter of the septenary alphabet is used at least once 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
5040, 20160, 105840, 438480, 1941390, 7981380, 34199295, 143278023, 618279060, 2662235895, 11732993885, 52051997928, 235469637340, 1076082576890, 5001152965060, 23506245393141, 112121385673903, 540819706031799, 2642597365003695, 13049933076792172 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,1

LINKS

Table of n, a(n) for n=7..26.

CROSSREFS

Column k=7 of A257783.

Sequence in context: A190107 A090393 A147632 * A226886 A284204 A159083

Adjacent sequences:  A321840 A321841 A321842 * A321844 A321845 A321846

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Nov 19 2018

STATUS

approved

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Last modified December 6 13:45 EST 2021. Contains 349563 sequences. (Running on oeis4.)