Half the number of (n+2)X9 binary arrays with each 3X3 subblock having sum 4 or 5.
A186823
Half the number of (n+2)X9 binary arrays with each 3X3 subblock having sum 4 or 5.
Terms
- a(0) =1750896a(1) =56422648a(2) =1653336285a(3) =52016332522
External references
- oeis: A186823