750261

Appears in sequences

• Half the number of (n+1)X(n+1) symmetric 0..2 arrays with no 2X2 subblock summing to 4.at n=3A213691
• T(n,k)=Half the number of (n+1)X(n+1) symmetric 0..k arrays with no 2X2 subblock summing to 2k.at n=13A213697
• Half the number of 5X5 0..n symmetric arrays with no 2X2 subblock summing to 2n.at n=1A213700