Consider problem of placing N queens on an n X n board so that each queen attacks precisely k others. Here k=4 and sequence gives number of inequivalent solutions when N = 3*n-3.
A051571
Consider problem of placing N queens on an n X n board so that each queen attacks precisely k others. Here k=4 and sequence gives number of inequivalent solutions when N = 3*n-3.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =3a(5) =40a(6) =615a(7) =16573a(8) =491734
External references
- oeis: A051571