222497

Appears in sequences

• Number of different hierarchical orderings that can be formed from n labeled elements: these are divided into groups and the elements in each group are then arranged in a "preferential arrangement" or "weak order" as in A000670.at n=7A075729
• Number of (w,x,y,z) with all terms in {0,...,n} and |w-x|=max{w,x,y,z}-min{w,x,y,z}.at n=32A212755
• Array of generalized Bell numbers, read by antidiagonals upwards.at n=34A321000