A187529
Number of 3X3 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.
Original entry on oeis.org
0, 8, 74, 280, 784, 1970, 3580, 6946, 11726, 19100, 27672, 44092, 58988, 83340, 116344, 156470, 193434, 262028, 316330, 414216, 517530, 629058, 735548, 935702, 1100836, 1299196, 1530340, 1835766, 2068728, 2511536, 2794280, 3249058, 3723336
Offset: 1
Some solutions for 3X3
..2..3..0....0..3..2....0..1..2....3..2..3....3..3..0....1..1..0....1..2..3
..1..3..1....1..3..1....2..2..2....1..1..2....1..2..1....1..3..2....1..1..1
..0..3..2....2..3..0....3..2..1....0..1..3....0..3..3....0..2..2....3..2..1
A187525
Number of (n+1)X(n+1) 0..1 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.
Original entry on oeis.org
6, 0, 104, 0, 9346, 0, 4278774, 0, 9966039904, 0, 118222727145122, 0, 7149579817467705382, 0, 2205539783282634028931328
Offset: 1
Some solutions for 4X4
..0..1..0..1....1..1..0..1....1..0..1..1....1..0..1..0....1..1..0..1
..1..0..1..0....1..0..1..0....0..1..0..1....0..1..0..1....1..0..1..1
..0..1..1..1....0..1..0..1....1..0..1..0....1..1..1..0....1..1..0..1
..1..0..1..0....1..1..1..1....0..1..1..1....0..1..0..1....1..0..1..0
A187526
Number of (n+1)X(n+1) 0..2 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.
Original entry on oeis.org
50, 8, 3790, 1476, 3607148, 296232
Offset: 1
Some solutions for 4X4
..2..1..0..1....2..0..2..0....1..0..1..0....2..2..0..2....2..2..2..2
..1..0..1..2....0..1..0..1....0..1..0..1....2..1..1..2....1..0..1..0
..1..1..0..1....2..2..2..2....1..2..1..2....2..2..0..2....2..2..0..2
..1..0..1..0....1..2..1..2....0..1..0..1....2..1..1..2....2..1..1..0
A187527
Number of (n+1)X(n+1) 0..3 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.
Original entry on oeis.org
192, 74, 35026, 20554, 164460556
Offset: 1
Some solutions for 4X4
..3..3..3..3....3..0..3..3....2..3..2..3....0..3..0..3....2..2..1..2
..2..3..2..3....1..3..0..3....0..1..0..1....3..0..3..1....1..0..1..0
..1..0..1..0....3..0..3..1....2..1..2..1....0..3..0..3....2..2..2..2
..1..3..0..3....3..3..0..3....0..1..0..1....3..3..3..1....3..2..3..2
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.
Original entry on oeis.org
104, 3790, 35026, 220802, 727842, 2327574, 5366230, 13768228, 28531154, 54987216, 90945478
Offset: 1
Some solutions for 4X4
..3..1..2..1....3..3..1..3....3..0..3..1....2..3..3..3....2..1..0..1
..1..0..1..0....2..3..0..3....1..2..0..2....1..0..1..0....2..0..2..1
..0..1..0..1....1..0..1..0....3..0..3..3....3..3..0..3....0..1..0..1
..1..0..1..0....0..3..0..3....0..2..0..2....1..0..1..2....2..3..2..2
A187531
Number of 5X5 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.
Original entry on oeis.org
0, 1476, 20554, 273102, 992410, 5880944
Offset: 1
Some solutions for 5X5
..2..3..3..0..3....3..3..1..0..1....2..0..2..1..3....0..2..1..0..1
..3..0..1..3..0....1..0..1..3..1....1..1..1..0..2....1..0..1..2..0
..2..3..2..3..1....3..3..2..3..2....2..1..2..1..2....1..2..2..2..1
..1..3..1..0..3....2..3..1..0..1....2..0..1..1..1....0..2..1..0..1
..3..0..3..3..1....1..0..1..3..3....1..1..2..0..2....1..2..2..2..2
Showing 1-6 of 6 results.
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