187320

Appears in sequences

• Triangle read by rows: T(n,k) is the number of functions f:{1,2,...,n}->{1,2,...,n} that have exactly k nonrecurrent elements mapped to some (one or more) recurrent element. n >= 1, 0 <= k <= n-1.at n=24A216971
• Triangle read by rows: number of idempotents of rank k in partial Brauer monoid PB_n.at n=61A256039