Number of n-length words w over 9-ary alphabet such that 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.
A213297
Number of n-length words w over 9-ary alphabet such that 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) =1a(1) =9a(2) =81a(3) =621a(4) =4293a(5) =26061a(6) =140517a(7) =676155a(8) =2990967a(9) =12602451a(10) =52359693a(11) =216954441a(12) =901911273a(13) =3778512489a(14) =16012113225a(15) =68739345546a(16) =299377174968
External references
- oeis: A213297