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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
0
104, 7954, 87258, 692410, 2363474, 10839282, 23999702, 69386216, 148926738
OFFSET
1,1
COMMENTS
Row 3 of A187699
EXAMPLE
Some n=3 solutions for 4X4
..0..2..0..2....0..3..0..3....2..1..2..1....0..1..0..1....0..1..3..2
..3..1..3..0....1..0..1..3....2..3..2..3....1..3..1..3....2..0..1..0
..0..2..0..2....0..1..0..1....3..1..3..1....1..2..1..2....0..1..0..2
..3..2..3..0....3..0..3..2....2..2..2..2....1..1..1..1....2..2..1..2
CROSSREFS
Sequence in context: A286329 A164759 A206013 * A015272 A048920 A091539
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 12 2011
STATUS
approved