636524

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= n/3.at n=22A047196
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n-1)/3.at n=22A048008
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n-2)/3.at n=22A048019
• Number of ways to place 8 nonattacking queens on an n X n board.at n=9A252593
• Number T(n,k) of ways to place k nonattacking queens on an n X n board; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=63A348129