Number of ways to place 9 points on an n X n board so that no more than 2 points are on a vertical or horizontal straight line.
A279443
Number of ways to place 9 points on an n X n board so that no more than 2 points are on a vertical or horizontal straight line.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =22650a(5) =4987800a(6) =240023070a(7) =5219088000a(8) =68483325960a(9) =630486309600
External references
- oeis: A279443