Number of ways to place n nonattacking composite pieces queen + rider[4,5] on an n X n chessboard.
A189881
Number of ways to place n nonattacking composite pieces queen + rider[4,5] on an n X n chessboard.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =2a(4) =10a(5) =4a(6) =12a(7) =32a(8) =96a(9) =144a(10) =528a(11) =1712a(12) =7472a(13) =24500a(14) =103536a(15) =486020a(16) =2218808a(17) =11113020a(18) =59242576a(19) =342584556a(20) =1981826412
External references
- oeis: A189881