520723

Appears in sequences

• Number A(n,k) of endofunctions on [n] such that no element has a preimage of cardinality k; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=62A245405
• Number of endofunctions on [n] such that no element has a preimage of cardinality three.at n=7A245407
• Number of nonnegative lattice paths from (0,0) to (n,0) where the allowed steps at (x,y) are (1,v) with v in {-1,0,...,max(y,1)}.at n=15A333105