1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having distinct edge sums.
A209728
1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having distinct edge sums.
Terms
- a(0) =22a(1) =1096a(2) =137888a(3) =47572464a(4) =45147495264
External references
- oeis: A209728