Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to at least one horizontal or vertical neighbor and the top left element equal to 0.
A267904
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to at least one horizontal or vertical neighbor and the top left element equal to 0.
Terms
- a(0) =0a(1) =30a(2) =138a(3) =17658a(4) =414138a(5) =28493946a(6) =1246334388a(7) =72638390592
External references
- oeis: A267904