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A193614
Number of n X n symmetric 0..7 arrays with no element equal to the sum mod 8 of all its horizontal and vertical neighbors
0
7, 343, 117649, 282480208, 4747561627592, 558545864083284007
OFFSET
1,1
EXAMPLE
Some solutions for 4X4
..4..0..0..7....4..0..0..1....4..0..0..6....4..0..4..4....4..0..0..7
..0..0..6..5....0..0..1..3....0..0..3..7....0..4..4..3....0..0..3..5
..0..6..0..4....0..1..4..3....0..3..7..7....4..4..7..6....0..3..7..2
..7..5..4..5....1..3..3..5....6..7..7..7....4..3..6..7....7..5..2..0
CROSSREFS
Sequence in context: A154024 A013712 A109493 * A194504 A347505 A015479
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 31 2011
STATUS
approved