Number of open knight's tour diagrams of a 3 X n chessboard that are symmetric under 180-degree rotation and have "type B": the endpoints occur in different columns and disagree in color with the cells in the nearest corner.
A169775
Number of open knight's tour diagrams of a 3 X n chessboard that are symmetric under 180-degree rotation and have "type B": the endpoints occur in different columns and disagree in color with the cells in the nearest corner.
Terms
- a(0) =2a(1) =0a(2) =0a(3) =0a(4) =8a(5) =0a(6) =16a(7) =0a(8) =48a(9) =0a(10) =200a(11) =0a(12) =616a(13) =0a(14) =1832a(15) =0a(16) =6008a(17) =0a(18) =19304a(19) =0a(20) =62180a(21) =0a(22) =189580a(23) =0a(24) =615792a(25) =0a(26) =1895952a(27) =0a(28) =6136708a(29) =0
External references
- oeis: A169775