1218772461

Appears in sequences

• Half the number of (n+2)X(n+2) binary arrays with no 3X3 subblock having a sum equal to any horizontal or vertical neighbor 3X3 subblock sum.at n=4A187955
• Half the number of (n+2)X7 binary arrays with no 3X3 subblock having a sum equal to any horizontal or vertical neighbor 3X3 subblock sum.at n=4A187960