Number of ways of placing n nonattacking superqueens on n X n board (symmetric solutions count only once).

A051224

Number of ways of placing n nonattacking superqueens on n X n board (symmetric solutions count only once).

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =1a(10) =6a(11) =22a(12) =239a(13) =653a(14) =4089a(15) =25411a(16) =166463a(17) =1115871a(18) =8062150a(19) =61984976a(20) =497236090a(21) =4261538564a(22) =38352532487a(23) =360400504834

External references