Number of permutations of 0..floor((n*9-1)/2) on even squares of an nX9 array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing.

A215787

Number of permutations of 0..floor((n*9-1)/2) on even squares of an nX9 array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing.

Terms

    a(0) =1a(1) =14a(2) =462a(3) =11694a(4) =530429a(5) =14296434a(6) =673507749a(7) =18255280444a(8) =862827082115

External references