1908891288

Appears in sequences

• Number of (n+1)X3 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces.at n=7A187133
• Number of (n+1)X9 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces.at n=1A187139