Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
A301945
Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =2a(2) =20a(3) =947a(4) =120815a(5) =58609226a(6) =86143630040
External references
- oeis: A301945