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A193784 Number of n X n symmetric 0..5 arrays with no element equal to the sum or difference mod 6 of any two of its horizontal and vertical neighbors 0
6, 75, 1383, 82057, 17485499, 12269256241, 26618983431241, 174570423155403607, 3439388112891290777185, 203331913765001724843185283, 36063230821901471856813524283909, 19188799396869069058685453832499056759 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for 4X4

..1..5..1..1....1..3..3..4....1..1..5..1....1..3..3..5....1..1..3..3

..5..3..3..3....3..3..3..3....1..3..1..5....3..3..5..5....1..1..1..5

..1..3..1..1....3..3..2..2....5..1..3..1....3..5..3..1....3..1..1..1

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

CROSSREFS

Sequence in context: A129031 A234529 A139088 * A162863 A216136 A126462

Adjacent sequences:  A193781 A193782 A193783 * A193785 A193786 A193787

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 05 2011

STATUS

approved

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Last modified August 24 13:48 EDT 2019. Contains 326279 sequences. (Running on oeis4.)