1/24 the number of (n+1) X (n+1) 0..3 arrays with every 2 X 2 subblock containing exactly three distinct values.
A183585
1/24 the number of (n+1) X (n+1) 0..3 arrays with every 2 X 2 subblock containing exactly three distinct values.
Terms
- a(0) =6a(1) =1243a(2) =1427084a(3) =9207834547
External references
- oeis: A183585