248619571200
domain: N
Appears in sequences
- Number of surjections from an n-element set onto a seven-element set.at n=7A135456
- Number of sequences over the alphabet of n symbols of length 2n which have n distinct symbols. Also number of placements of 2n balls into n cells where no cell is empty.at n=6A210029
- a(n) = Stirling2(n, floor(n/2)) * floor(n/2)!.at n=14A344397