Number of ways to place n nonattacking composite pieces queen + leaper[2,4] on an n X n chessboard.
A189868
Number of ways to place n nonattacking composite pieces queen + leaper[2,4] on an n X n chessboard.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =2a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =4a(10) =64a(11) =384a(12) =2936a(13) =10720a(14) =62664a(15) =420272a(16) =2540584a(17) =16373760a(18) =115200080a(19) =868564232a(20) =6708291360
External references
- oeis: A189868