1/4 the number of (n+1) X 7 0..3 arrays with every 2 X 2 subblock having distinct edge sums.
A209734
1/4 the number of (n+1) X 7 0..3 arrays with every 2 X 2 subblock having distinct edge sums.
Terms
- a(0) =123480a(1) =6933120a(2) =420545824a(3) =27425792944
External references
- oeis: A209734