70858

Appears in sequences

• Triangle read by rows: T(n,k) = number of n-element unlabeled N-free posets of height k (1 <= k <= n).at n=58A202181
• Numbers k such that 5*10^k + 21 is prime.at n=23A281839
• Number of length-n binary words closed by an unbordered word.at n=20A332983