Number of ways to place n nonattacking composite pieces queen + leaper[2,3] on an n X n chessboard.

A189867

Number of ways to place n nonattacking composite pieces queen + leaper[2,3] on an n X n chessboard.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =2a(4) =10a(5) =0a(6) =0a(7) =0a(8) =0a(9) =48a(10) =152a(11) =472a(12) =2696a(13) =12320a(14) =74436a(15) =429620a(16) =2515116a(17) =16122496a(18) =113016608a(19) =843492920a(20) =6575649316a(21) =54694203188

External references