A187625
Number of 3X3 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation.
Original entry on oeis.org
24, 446, 2924, 12104, 37448, 98014, 221640, 457632, 871712, 1562702, 2649632, 4329136, 6782660, 10323450, 15291860, 22111560, 31246860, 43422938, 59215112, 79658992, 105617736, 138251814, 178796912, 229108212, 290437464, 364933542
Offset: 1
Some n=3 solutions for 3X3
..3..0..3....3..0..3....2..2..2....1..3..0....1..1..3....0..2..3....1..3..1
..3..3..0....0..2..3....1..3..1....1..0..1....1..0..1....1..0..1....2..3..2
..3..0..3....3..0..3....2..2..2....3..3..1....0..1..3....1..2..2....1..3..1
A187621
Number of (n+1)X(n+1) 0..1 arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation.
Original entry on oeis.org
10, 24, 2, 948, 36, 190972, 3020, 194618700, 929380, 1018751442652, 1744283776, 27189851221308572, 15262275217840
Offset: 1
All solutions for 4X4
..1..1..0..1....1..0..1..1
..0..1..1..1....1..1..1..0
..1..1..1..0....0..1..1..1
..1..0..1..1....1..1..0..1
A187622
Number of (n+1)X(n+1) 0..2 arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation.
Original entry on oeis.org
31, 446, 60, 324452, 70548, 6090023738, 720252796
Offset: 1
Some solutions for 4X4
..1..2..0..2....2..2..0..2....1..1..2..1....1..2..1..1....2..0..1..2
..0..2..1..2....0..2..2..2....2..1..1..1....1..1..1..2....1..2..2..0
..1..2..1..0....2..2..2..0....1..1..1..2....2..1..1..1....0..2..2..1
..1..0..1..2....2..0..2..2....1..2..1..1....1..1..2..1....2..1..0..2
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.
Original entry on oeis.org
64, 2924, 390, 12278892, 4232368
Offset: 1
Some solutions for 4X4
..1..0..2..3....1..1..0..1....1..3..2..3....2..1..0..2....1..2..1..2
..3..1..1..1....0..1..1..1....0..1..1..1....0..1..1..2....0..1..1..1
..1..1..1..3....1..1..1..0....1..1..1..0....1..1..1..1....1..1..1..0
..3..2..0..1....2..1..2..1....3..2..3..1....2..0..1..3....2..1..2..1
A187626
Number of 4X4 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation.
Original entry on oeis.org
2, 60, 390, 2146, 5324, 16042, 28916, 71012, 121678, 216768, 302470, 606282, 785548
Offset: 1
Some n=3 solutions for 4X4
..1..3..0..3....1..0..2..1....3..2..0..2....3..1..0..3....2..2..0..2
..0..3..1..3....3..1..1..0....2..2..1..2....0..3..3..1....0..2..2..3
..1..3..1..0....1..1..1..2....3..2..1..0....1..3..3..0....2..2..2..1
..2..3..2..3....3..2..0..1....1..0..1..2....3..0..1..3....2..0..2..3
A187627
Number of 5X5 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation.
Original entry on oeis.org
948, 324452, 12278892, 221177664, 1896404966
Offset: 1
Some n=3 solutions for 5X5
..2..0..3..0..2....1..0..3..0..1....1..0..1..1..2....1..0..3..0..1
..0..2..3..2..3....0..2..0..2..0....0..2..0..2..2....0..2..1..2..1
..3..0..3..0..3....3..2..3..0..3....1..0..1..0..1....3..0..2..0..3
..1..2..0..2..1....0..2..0..2..0....0..2..1..2..2....0..2..0..2..2
..2..0..3..2..3....1..1..3..3..1....1..2..2..2..3....1..0..3..1..2
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