

A321842


Number of words w of length n such that each letter of the senary 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 ith letter in z.


1



720, 2520, 11760, 43848, 176490, 665115, 2630715, 10224492, 41126477, 165441810, 683213215, 2840595291, 12061223560, 51668953199, 225204435800, 990537353423, 4420156777761, 19894290092220, 90640449133488, 416216322774452, 1931286827029792, 9024993532633957
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OFFSET

6,1


LINKS



CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



