Number of (n+2)X(4+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 4 or more.
A251857
Number of (n+2)X(4+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 4 or more.
Terms
- a(0) =2525037a(1) =216245728a(2) =20861600041
External references
- oeis: A251857