Number of permutations of 0..floor((n*6-1)/2) on even squares of an nX6 array such that each row and column of even squares is increasing.

A215290

Number of permutations of 0..floor((n*6-1)/2) on even squares of an nX6 array such that each row and column of even squares is increasing.

Terms

    a(0) =1a(1) =20a(2) =420a(3) =23100a(4) =1051050a(5) =85765680a(6) =5703417720a(7) =577185873264

External references