Number of (n+1)X(n+1) 0..3 arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation.
A187623
Number of (n+1)X(n+1) 0..3 arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation.
Terms
- a(0) =64a(1) =2924a(2) =390a(3) =12278892a(4) =4232368
External references
- oeis: A187623