The count of how many queens must be placed tentatively onto a board while seeking a first solution to the "N-Queens on an N x N chessboard" puzzle.

A140450

The count of how many queens must be placed tentatively onto a board while seeking a first solution to the "N-Queens on an N x N chessboard" puzzle.

Terms

    a(0) =1a(1) =6a(2) =18a(3) =26a(4) =15a(5) =171a(6) =42a(7) =876a(8) =333a(9) =975a(10) =517a(11) =3066a(12) =1365a(13) =26495a(14) =20280a(15) =160712a(16) =91222a(17) =743229a(18) =48184a(19) =3992510a(20) =179592a(21) =38217905a(22) =584591a(23) =9878316a(24) =1216775a(25) =10339849a(26) =12263400a(27) =84175966a(28) =44434525a(29) =1692888135

External references