Number of nX2 nonnegative integer arrays with adjacent horizontal and vertical element pair sums equal to all values in 0..2nk-n-k-1 (each exactly once).
A203020
Number of nX2 nonnegative integer arrays with adjacent horizontal and vertical element pair sums equal to all values in 0..2nk-n-k-1 (each exactly once).
Terms
- a(0) =1a(1) =8a(2) =36a(3) =544a(4) =12700a(5) =431432a(6) =17482140a(7) =1012606444
External references
- oeis: A203020