Number of 4X4 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.
A187530
Number of 4X4 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.
Terms
- a(0) =104a(1) =3790a(2) =35026a(3) =220802a(4) =727842a(5) =2327574a(6) =5366230a(7) =13768228a(8) =28531154a(9) =54987216a(10) =90945478
External references
- oeis: A187530