Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
A301993
Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =2a(2) =5a(3) =74a(4) =2856a(5) =100176a(6) =15243860a(7) =3267873712
External references
- oeis: A301993