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A193223
Number of n X n symmetric 0..5 arrays with no element equal to the sum mod 6 of any two of its horizontal and vertical neighbors
0
6, 123, 5571, 643473, 194123061, 159836740359, 373087393798011, 2568694794232177467
OFFSET
1,1
EXAMPLE
Some solutions for 4X4
..3..0..5..1....3..0..2..1....0..1..3..5....3..3..4..4....3..3..3..3
..0..2..0..5....0..1..4..1....1..3..3..3....3..4..3..3....3..1..5..1
..5..0..5..2....2..4..5..4....3..3..4..3....4..3..3..4....3..5..3..5
..1..5..2..2....1..1..4..4....5..3..3..1....4..3..4..3....3..1..5..3
CROSSREFS
Sequence in context: A356199 A078261 A239752 * A372920 A132507 A223112
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 18 2011
STATUS
approved