Number of (n+1)X(n+1) 0..7 arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum.
A187407
Number of (n+1)X(n+1) 0..7 arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum.
Terms
- a(0) =64a(1) =18152a(2) =28371968a(3) =268405348864
External references
- oeis: A187407