Number of 4X4 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.
A187700
Number of 4X4 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.
Terms
- a(0) =104a(1) =7954a(2) =87258a(3) =692410a(4) =2363474a(5) =10839282a(6) =23999702a(7) =69386216a(8) =148926738
External references
- oeis: A187700