Number of ways to place n nonattacking composite pieces rook + rider[3,3] on an n X n chessboard.
A189839
Number of ways to place n nonattacking composite pieces rook + rider[3,3] on an n X n chessboard.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =80a(5) =384a(6) =2112a(7) =12992a(8) =94272a(9) =716800a(10) =6141440a(11) =58451568a(12) =596647568a(13) =6555879072a(14) =77766001056a(15) =981202169600
External references
- oeis: A189839