Number of (n+1)X(n+1) 0..3 arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular.
A187631
Number of (n+1)X(n+1) 0..3 arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular.
Terms
- a(0) =64a(1) =2924a(2) =14044a(3) =31903442a(4) =33869160
External references
- oeis: A187631