Number of ways to place n nonattacking composite pieces rook + rider[2,2] on an n X n chessboard.

A189838

Number of ways to place n nonattacking composite pieces rook + rider[2,2] on an n X n chessboard.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =16a(4) =36a(5) =128a(6) =672a(7) =4264a(8) =25044a(9) =173712a(10) =1318904a(11) =11069056a(12) =96808692a(13) =927478976a(14) =9435033872a(15) =103783608480

External references