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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..6.

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

Adjacent sequences:  A193610 A193611 A193612 * A193614 A193615 A193616

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 31 2011

STATUS

approved

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Last modified October 22 07:06 EDT 2021. Contains 348160 sequences. (Running on oeis4.)