149022720

Appears in sequences

• a(1) = 1, a(n) = a(n-1) if n == 1 (mod 4), otherwise a(n) = n * a(n-1) for n >= 2.at n=13A123145
• Triangle T(n,k) of ways n couples can sit in a row with exactly k of them together.at n=33A193639
• Number of labeled fully chiral simple graphs (also called identity or asymmetric graphs) covering n vertices.at n=7A330343