Number of nX2 0..n+2-2 arrays with each element differing from its horizontal and vertical neighbors by one or two.
A265452
Number of nX2 0..n+2-2 arrays with each element differing from its horizontal and vertical neighbors by one or two.
Terms
- a(0) =2a(1) =18a(2) =250a(3) =3358a(4) =42282a(5) =502154a(6) =5710302a(7) =62782966a(8) =672520310a(9) =7056533978a(10) =72819524370a(11) =741279145398
External references
- oeis: A265452