Number of ways of placing n nonattacking Queens of the Night on an n X n board.

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =4a(10) =44a(11) =6a(12) =78a(13) =8a(14) =16a(15) =18a(16) =234a(17) =124a(18) =468a(19) =516a(20) =882a(21) =2092a(22) =7068a(23) =22794a(24) =85456a(25) =275732a(26) =974048a(27) =3698242a(28) =14120996a(29) =59531852