A321845 Number of words w of length n such that each letter of the nonary 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.

362880, 1814400, 11642400, 57879360, 302856840, 1452611160, 7181851950, 34386725520, 168206363745, 815113118385, 4018968988380, 19841370665865, 99477246363495, 502000638243720, 2569888903846460, 13275926076237132, 69519580918458790, 367795800026341605

Offset

9,1

Links

Table of n, a(n) for n=9..26.

Crossrefs

Column k=9 of A257783.

Sequence in context: A110452 A354708 A011520 * A226888 A284206 A179736

Adjacent sequences: A321842 A321843 A321844 * A321846 A321847 A321848

Keyword

nonn

Author

Alois P. Heinz, Nov 19 2018

Status

approved