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A193504 Number of n X n symmetric 0..7 arrays with no element equal to the product mod 8 of any two of its horizontal and vertical neighbors 0
8, 350, 75812, 86657138, 519573586778, 16183893186795145, 2624329648165988321828 (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..2..4..3....0..2..0..5....0..2..0..3....0..2..4..1....0..2..0..2

..2..0..1..2....2..0..7..6....2..0..5..3....2..0..5..7....2..0..5..3

..4..1..2..0....0..7..5..7....0..5..2..3....4..5..2..1....0..5..3..2

..3..2..0..6....5..6..7..0....3..3..3..6....1..7..1..6....2..3..2..3

CROSSREFS

Sequence in context: A305088 A316739 A079485 * A158363 A221044 A221163

Adjacent sequences:  A193501 A193502 A193503 * A193505 A193506 A193507

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 29 2011

STATUS

approved

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Last modified October 26 13:09 EDT 2021. Contains 348267 sequences. (Running on oeis4.)