Number of n X 2 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).

A207978

Number of n X 2 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).

Terms

    a(0) =1a(1) =2a(2) =7a(3) =67a(4) =1080a(5) =25287a(6) =794545a(7) =31858034a(8) =1573857867a(9) =93345011951

External references