Number of ways to arrange 6 nonattacking knights on the lower triangle of an n X n board.

A194490

Number of ways to arrange 6 nonattacking knights on the lower triangle of an n X n board.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =230a(5) =4257a(6) =44005a(7) =312296a(8) =1693828a(9) =7449231a(10) =27785786a(11) =90732814a(12) =265594944a(13) =709634275a(14) =1755164932a(15) =4063548824a(16) =8885486966a(17) =18484419808a(18) =36802865115a(19) =70481362597a(20) =130377759323a(21) =233782433461a(22) =407584477894

External references