Number of nonequivalent ways to place n nonattacking kings on a 2 X 2n chessboard under all symmetry operations of the rectangle.

A322284

Number of nonequivalent ways to place n nonattacking kings on a 2 X 2n chessboard under all symmetry operations of the rectangle.

Terms

    a(0) =1a(1) =4a(2) =8a(3) =22a(4) =48a(5) =116a(6) =256a(7) =584a(8) =1280a(9) =2832a(10) =6144a(11) =13344a(12) =28672a(13) =61504a(14) =131072a(15) =278656a(16) =589824a(17) =1245440a(18) =2621440a(19) =5505536a(20) =11534336a(21) =24118272a(22) =50331648a(23) =104859648a(24) =218103808a(25) =452988928a(26) =939524096a(27) =1946165248a(28) =4026531840a(29) =8321515520

External references