3405357682

Appears in sequences

• Number of partial permutations of an n-set; number of n X n binary matrices with at most one 1 in each row and column.at n=11A002720
• Denominators of continued fraction for alternating factorial.at n=22A056953
• Number of ways to place k non-attacking bishops on an n x n toroidal chessboard, summed over all k >= 0.at n=10A215943