3630780

Appears in sequences

• Number of partitions of the set {1,2,...n} having no blocks that contain both odd and even entries.at n=15A124419
• Product of two successive Bell numbers.at n=7A124426
• Triangle, read by rows, where T(n,k) = A049020([n/2],k)*A049020([(n+1)/2],k).at n=64A124526