Number of permutations of 0..floor((5*n-1)/2) on even squares of an 5*n array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing.
A215791
Number of permutations of 0..floor((5*n-1)/2) on even squares of an 5*n array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =25a(5) =189a(6) =2465a(7) =26451a(8) =530429a(9) =7027942a(10) =187205626a(11) =2850280812
External references
- oeis: A215791