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.
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.
Terms
- a(0) =5040a(1) =20160a(2) =105840a(3) =438480a(4) =1941390a(5) =7981380a(6) =34199295a(7) =143278023a(8) =618279060a(9) =2662235895a(10) =11732993885a(11) =52051997928a(12) =235469637340
External references
- oeis: A321843