Number of ways to place n nonattacking composite pieces rook + rider[1,3] on an n X n chessboard.
A189850
Number of ways to place n nonattacking composite pieces rook + rider[1,3] on an n X n chessboard.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =8a(4) =24a(5) =126a(6) =316a(7) =1344a(8) =7782a(9) =33930a(10) =172430a(11) =1106754a(12) =6432236a(13) =45188572a(14) =372437930a(15) =2728674526a(16) =23648822368a(17) =233010291526
External references
- oeis: A189850