Number of n X 4 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).
A207980
Number of n X 4 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) =15a(1) =1080a(2) =587208a(3) =953124784
External references
- oeis: A207980