1139569

Appears in sequences

• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 00100-00100-11111 pattern in any orientation.at n=19A147001
• Number of nX2 0..3 arrays with rows and columns in nondecreasing order.at n=8A184122
• Triangle read by rows: T(n,k) is the number of subpermutations of an n-set whose orbits are each of size at most k.at n=41A261763