Number of ways to place 6 nonattacking semi-queens on an n X n board.
A202657
Number of ways to place 6 nonattacking semi-queens on an n X n board.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =83a(6) =6107a(7) =126376a(8) =1377328a(9) =9984758a(10) =54399330a(11) =239675936a(12) =895773148a(13) =2935757573a(14) =8641608781a(15) =23259768860a(16) =58039719112a(17) =135720432200a(18) =299995484600a(19) =631220344328
External references
- oeis: A202657