170811

Appears in sequences

• Number of (n+1)X8 0..2 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.at n=7A186470
• Number of (n+1)X9 0..2 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.at n=6A186471
• Number of Dyck n-paths all of whose ascents have lengths equal to 1 (mod 8).at n=20A212388