Number of arrangements of n nonattacking Queens on an n X n board, with no Queens on both main diagonals.

A225740

Number of arrangements of n nonattacking Queens on an n X n board, with no Queens on both main diagonals.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =2a(4) =0a(5) =4a(6) =0a(7) =12a(8) =8a(9) =12a(10) =64a(11) =760a(12) =2080a(13) =11524a(14) =77672a(15) =454376a(16) =2972720a(17) =19274208a(18) =160500016a(19) =1150812148a(20) =9797154696a(21) =79646705916a(22) =771589104392

External references