Number of ways to place n nonattacking nightriders on an n X n toroidal board.
A190393
Number of ways to place n nonattacking nightriders on an n X n toroidal board.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =144a(6) =28a(7) =1408a(8) =2025a(9) =86400a(10) =1782a(11) =1092096a(12) =4186a(13) =31360a(14) =241920000a(15) =23953408a(16) =140692a(17) =114108912a(18) =1092690
External references
- oeis: A190393