460857600

Appears in sequences

• Number of ways to arrange n women and n men around a circular table so that they can be divided into n nonintersecting pairs of 1 woman and 1 man sitting side-by-side.at n=7A273935
• Number of minimum dominating sets in the n X n black bishop graph.at n=21A323500
• Number of minimum dominating sets in the n X n white bishop graph.at n=20A323501