1/120 the number of (n+1)X(n+1) 0..4 arrays with every 2X2 subblock containing four distinct values.
A183614
1/120 the number of (n+1)X(n+1) 0..4 arrays with every 2X2 subblock containing four distinct values.
Terms
- a(0) =1a(1) =56a(2) =7792a(3) =2708848a(4) =2359936032
External references
- oeis: A183614