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 i-th letter in z.

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

Offset

6,1

Links

Table of n, a(n) for n=6..27.

Crossrefs

Column k=6 of A257783.

Sequence in context: A253734 A112530 A052800 * A052794 A226885 A096933

Adjacent sequences: A321839 A321840 A321841 * A321843 A321844 A321845

Keyword

nonn

Author

Alois P. Heinz, Nov 19 2018

Status

approved