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

A189876

Number of ways to place n nonattacking composite pieces queen + rider[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) =16a(10) =60a(11) =40a(12) =304a(13) =620a(14) =2512a(15) =8734a(16) =28410a(17) =94312a(18) =345824a(19) =1391072a(20) =5759566a(21) =25227796a(22) =121663032a(23) =635977968

External references