Number of permutations of 0..floor((4*n-1)/2) on even squares of an 4*n array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing.
A215790
Number of permutations of 0..floor((4*n-1)/2) on even squares of an 4*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) =2a(4) =10a(5) =29a(6) =262a(7) =932a(8) =11694a(9) =46988a(10) =727846a(11) =3166688a(12) =56797272a(13) =261286670a(14) =5219906670a(15) =25024705056
External references
- oeis: A215790