Number of n X n 0..1 arrays with exactly n+n-2 having value 1 and no three 1's forming an isosceles right triangle.
A272951
Number of n X n 0..1 arrays with exactly n+n-2 having value 1 and no three 1's forming an isosceles right triangle.
Terms
- a(0) =1a(1) =6a(2) =24a(3) =60a(4) =768a(5) =7468a(6) =131056a(7) =4614732
External references
- oeis: A272951