Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.
A252051
Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.
Terms
- a(0) =7642a(1) =10324a(2) =17166a(3) =29180a(4) =112542a(5) =233342a(6) =398502a(7) =1545586a(8) =3493324a(9) =6364926a(10) =25030764a(11) =55982864a(12) =107529180a(13) =434690496a(14) =981158992a(15) =1847050606a(16) =7975660404a(17) =17661934362a(18) =33398453950a(19) =148936808798a(20) =330139202194a(21) =605355952468
External references
- oeis: A252051