Number of nX4 arrays of permutations of 4 copies of 0..n-1 with every element equal to at least one horizontal or vertical neighbor and the top left element equal to 0.
A267900
Number of nX4 arrays of permutations of 4 copies of 0..n-1 with every element equal to at least one horizontal or vertical neighbor and the top left element equal to 0.
Terms
- a(0) =1a(1) =11a(2) =268a(3) =17658a(4) =1696920a(5) =273460560a(6) =59383337040
External references
- oeis: A267900