Number of ways to place n nonattacking bishops on an n X n toroidal board.
A189790
Number of ways to place n nonattacking bishops on an n X n toroidal board.
Terms
- a(0) =1a(1) =4a(2) =6a(3) =64a(4) =120a(5) =2304a(6) =5040a(7) =147456a(8) =362880a(9) =14745600a(10) =39916800a(11) =2123366400a(12) =6227020800a(13) =416179814400
External references
- oeis: A189790