109820000

Appears in sequences

• Half the number of (n+1) X (n+1) symmetric 0..3 arrays with no 2 X 2 subblock summing to 6.at n=3A213692
• 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=18A213697
• Half the number of 5X5 0..n symmetric arrays with no 2X2 subblock summing to 2n.at n=2A213700