Number of (n+1)X(n+1) 0..2 arrays with the array of 2X2 subblock determinants symmetric.

A187454

Number of (n+1)X(n+1) 0..2 arrays with the array of 2X2 subblock determinants symmetric.

Terms

    a(0) =81a(1) =5175a(2) =1293651a(3) =983320335

External references