Number of ways to place n nonattacking composite pieces rook + rider[1,5] on an n X n chessboard.
A189852
Number of ways to place n nonattacking composite pieces rook + rider[1,5] on an n X n chessboard.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =336a(6) =1474a(7) =8340a(8) =57756a(9) =475658a(10) =2812910a(11) =20852460a(12) =181255892a(13) =1817101242a(14) =20435345782a(15) =197871434994
External references
- oeis: A189852