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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
0
0, 1476, 20554, 273102, 992410, 5880944
OFFSET
1,2
COMMENTS
Row 4 of A187528
EXAMPLE
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
CROSSREFS
Sequence in context: A167575 A157505 A290723 * A251218 A188363 A334687
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 10 2011
STATUS
approved