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A193811 Number of n X n symmetric 0..6 arrays with no element equal to the difference mod 7 of any two of its horizontal and vertical neighbors 0
7, 186, 8064, 722340, 150684732, 82103110920, 123085880400552, 516200827188869448 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for 4X4

..1..0..0..4....2..0..4..6....3..3..4..5....3..3..1..3....4..0..2..4

..0..2..1..0....0..6..0..0....3..2..4..4....3..1..1..3....0..1..3..0

..0..1..4..0....4..0..3..2....4..4..4..3....1..1..3..1....2..3..2..6

..4..0..0..5....6..0..2..3....5..4..3..5....3..3..1..1....4..0..6..5

CROSSREFS

Sequence in context: A176338 A012843 A012798 * A219567 A202791 A010332

Adjacent sequences:  A193808 A193809 A193810 * A193812 A193813 A193814

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 05 2011

STATUS

approved

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Last modified December 8 06:50 EST 2016. Contains 278902 sequences.