Number of permutations of 0..floor((n*6-2)/2) on odd squares of an n X 6 array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing.

A215866

Number of permutations of 0..floor((n*6-2)/2) on odd squares of an n X 6 array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing.

Terms

    a(0) =1a(1) =5a(2) =12a(3) =78a(4) =189a(5) =1233a(6) =2988a(7) =19494a(8) =47241a(9) =308205a(10) =746892a(11) =4872798a(12) =11808549a(13) =77040153a(14) =186696108a(15) =1218024054a(16) =2951712081a(17) =19257264405a(18) =46667304972a(19) =304462158318a(20) =737821743309

External references