Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 1 1 diagonally, vertically or horizontally.
A190421
Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 1 1 diagonally, vertically or horizontally.
Terms
- a(0) =41a(1) =418a(2) =7196a(3) =204512a(4) =10058896a(5) =841847949a(6) =119691599225
External references
- oeis: A190421