Number of 2Xn nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or antidiagonal neighbor (colorings ignoring permutations of colors).
A208302
Number of 2Xn nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or antidiagonal neighbor (colorings ignoring permutations of colors).
Terms
- a(0) =2a(1) =5a(2) =42a(3) =602a(4) =12840a(5) =373780a(6) =14050312a(7) =656404264a(8) =37060650272
External references
- oeis: A208302