Number of permutations of 0..floor((n*5-1)/2) on even squares of an n X 5 array such that each row and column of even squares is increasing.

A215289

Number of permutations of 0..floor((n*5-1)/2) on even squares of an n X 5 array such that each row and column of even squares is increasing.

Terms

    a(0) =1a(1) =10a(2) =140a(3) =2100a(4) =60060a(5) =1051050a(6) =42882840a(7) =814773960a(8) =41227562376a(9) =824551247520

External references