Number A(n,k) of n-length words w over a k-ary alphabet {a_1,...,a_k} such that w contains never more than j consecutive letters a_j (for 1<=j<=k); square array A(n,k), n>=0, k>=0, read by antidiagonals.

A242464

Number A(n,k) of n-length words w over a k-ary alphabet {a_1,...,a_k} such that w contains never more than j consecutive letters a_j (for 1<=j<=k); square array A(n,k), n>=0, k>=0, read by antidiagonals.