Number of ways to place n nonattacking composite pieces rook + semi-rider[3,3] on an n X n chessboard.
A189844
Number of ways to place n nonattacking composite pieces rook + semi-rider[3,3] on an n X n chessboard.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =22a(4) =98a(5) =534a(6) =3334a(7) =23724a(8) =191820a(9) =1704532a(10) =16689868a(11) =179288892a(12) =2069311996a(13) =25760882744a(14) =345073745880
External references
- oeis: A189844