Half the number of (n+1)X(n+1) symmetric 0..6 arrays with no 2X2 subblock summing to 12.
A213695
Half the number of (n+1)X(n+1) symmetric 0..6 arrays with no 2X2 subblock summing to 12.
Terms
- a(0) =159a(1) =45892a(2) =84059234a(3) =976919547736
External references
- oeis: A213695