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A193504
Number of n X n symmetric 0..7 arrays with no element equal to the product mod 8 of any two of its horizontal and vertical neighbors
0
8, 350, 75812, 86657138, 519573586778, 16183893186795145, 2624329648165988321828
OFFSET
1,1
EXAMPLE
Some solutions for 4X4
..0..2..4..3....0..2..0..5....0..2..0..3....0..2..4..1....0..2..0..2
..2..0..1..2....2..0..7..6....2..0..5..3....2..0..5..7....2..0..5..3
..4..1..2..0....0..7..5..7....0..5..2..3....4..5..2..1....0..5..3..2
..3..2..0..6....5..6..7..0....3..3..3..6....1..7..1..6....2..3..2..3
CROSSREFS
Sequence in context: A305088 A316739 A079485 * A158363 A221044 A221163
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 29 2011
STATUS
approved