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A193503 Number of n X n symmetric 0..6 arrays with no element equal to the product mod 7 of any two of its horizontal and vertical neighbors 0
7, 225, 27834, 14180874, 29121196977, 242376304739292, 8162203076559295407 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A322709 A015506 A210099 * A303533 A142606 A123832

Adjacent sequences:  A193500 A193501 A193502 * A193504 A193505 A193506

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 29 2011

STATUS

approved

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Last modified May 26 18:08 EDT 2020. Contains 334630 sequences. (Running on oeis4.)