Number of n X 3 nonnegative integer arrays with adjacent horizontal and vertical element pair sums equal to all values in 0..2nk-n-k-1 (each exactly once).
A203021
Number of n X 3 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) =2a(1) =36a(2) =3216a(3) =257664a(4) =69822004
External references
- oeis: A203021