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A193812 Number of n X n symmetric 0..7 arrays with no element equal to the difference mod 8 of any two of its horizontal and vertical neighbors 0
8, 307, 28645, 7557081, 6251248141, 18554336578573, 227380925067925105 (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

..4..4..2..7....4..6..4..0....4..6..0..7....4..6..4..4....4..4..2..7

..4..4..7..7....6..4..6..5....6..4..0..6....6..4..7..7....4..4..4..4

..2..7..2..4....4..6..5..7....0..0..7..4....4..7..7..4....2..4..7..6

..7..7..4..7....0..5..7..3....7..6..4..7....4..7..4..2....7..4..6..3

CROSSREFS

Sequence in context: A317457 A220998 A222091 * A222095 A231124 A081980

Adjacent sequences:  A193809 A193810 A193811 * A193813 A193814 A193815

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 05 2011

STATUS

approved

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Last modified May 6 09:45 EDT 2021. Contains 343580 sequences. (Running on oeis4.)