Number of ways to place n nonattacking composite pieces queen + leaper[1,4] on an n X n chessboard.

A189865

Number of ways to place n nonattacking composite pieces queen + leaper[1,4] on an n X n chessboard.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =2a(4) =10a(5) =0a(6) =0a(7) =4a(8) =32a(9) =76a(10) =196a(11) =632a(12) =3368a(13) =12532a(14) =79788a(15) =468286a(16) =2815088a(17) =18287968a(18) =126620984a(19) =938037664a(20) =7232141830a(21) =59774887344

External references