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A193810 Number of n X n symmetric 0..5 arrays with no element equal to the difference mod 6 of any two of its horizontal and vertical neighbors. 0
6, 109, 2785, 160273, 31474553, 21334488089, 46140355278097, 306619332905168069, 6168636777847547479765 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for 4 X 4:

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

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

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

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

CROSSREFS

Sequence in context: A337580 A288629 A041149 * A217987 A119814 A227443

Adjacent sequences:  A193807 A193808 A193809 * A193811 A193812 A193813

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 05 2011

STATUS

approved

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Last modified May 16 06:54 EDT 2021. Contains 343939 sequences. (Running on oeis4.)