Number of n X n 0..1 arrays with exactly n+n-1 having value 1 and no three 1's forming an isosceles right triangle.
A272959
Number of n X n 0..1 arrays with exactly n+n-1 having value 1 and no three 1's forming an isosceles right triangle.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =12a(5) =192a(6) =4892a(7) =230268
External references
- oeis: A272959