255374826

Appears in sequences

• Number of (n+1) X (4+1) 0..3 arrays with the upper median of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=4A237970
• Number of (n+1)X(5+1) 0..3 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=3A237971