2209276

Appears in sequences

• Number T(n,k) of sets of nonempty words with a total of n letters over k-ary alphabet such that all k letters occur at least once in the set; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=49A319501
• Number of sets of nonempty words with a total of n letters over quaternary alphabet such that all letters occur at least once in the set.at n=5A320205