1011136

Appears in sequences

• Number of (n+1)X(n+1) 0..1 arrays with the array of 2X2 subblock determinants symmetric.at n=3A187453
• T(n,k)=Number of (n+1)X(n+1) 0..k arrays with the array of 2X2 subblock determinants symmetric.at n=9A187457