Number of ways to place n nonattacking composite pieces queen + rider[2,5] on an n X n chessboard.

A189878

Number of ways to place n nonattacking composite pieces queen + rider[2,5] on an n X n chessboard.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =2a(4) =10a(5) =4a(6) =28a(7) =20a(8) =56a(9) =72a(10) =200a(11) =644a(12) =2940a(13) =9152a(14) =39200a(15) =166100a(16) =739924a(17) =3586840a(18) =18640500a(19) =107580592a(20) =547737844a(21) =3080550788

External references