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.
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.
Terms
- a(0) =362880a(1) =1814400a(2) =11642400a(3) =57879360a(4) =302856840a(5) =1452611160a(6) =7181851950a(7) =34386725520a(8) =168206363745a(9) =815113118385
External references
- oeis: A321845