16537086

Appears in sequences

• Half the number of (n+1)X(n+1) symmetric 0..5 arrays with no 2X2 subblock summing to 10.at n=2A213694
• 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=23A213697
• Half the number of 4X4 0..n symmetric arrays with no 2X2 subblock summing to 2n.at n=4A213699