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A193613
Number of n X n symmetric 0..6 arrays with no element equal to the sum mod 7 of all its horizontal and vertical neighbors
0
6, 216, 46662, 60466182, 470185031232, 21936950640377856
OFFSET
1,1
EXAMPLE
Some solutions for 4X4
..0..3..1..5....0..3..0..0....0..3..1..0....0..3..0..0....0..3..0..1
..3..0..5..2....3..0..2..6....3..0..1..4....3..0..0..2....3..0..1..3
..1..5..0..4....0..2..0..1....1..1..1..0....0..0..4..1....0..1..6..0
..5..2..4..0....0..6..1..0....0..4..0..4....0..2..1..3....1..3..0..1
CROSSREFS
Sequence in context: A300593 A281431 A109354 * A194503 A229869 A234610
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 31 2011
STATUS
approved