Half the number of (n+2)X7 binary arrays with each 3X3 subblock having sum 4 or 5.
A186821
Half the number of (n+2)X7 binary arrays with each 3X3 subblock having sum 4 or 5.
Terms
- a(0) =70767a(1) =1190637a(2) =18829218a(3) =315843055a(4) =5634207241a(5) =99751773733
External references
- oeis: A186821