Number of ways to place n nonattacking composite pieces rook + rider[3,5] on an n X n chessboard.
A189859
Number of ways to place n nonattacking composite pieces rook + rider[3,5] on an n X n chessboard.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =464a(6) =2274a(7) =13236a(8) =91760a(9) =740562a(10) =5305548a(11) =43237840a(12) =395858894a(13) =4087066620a(14) =46633569480a(15) =509698057110
External references
- oeis: A189859