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 A193481 Number of n X n symmetric 0..2 arrays with each element equal to the product mod 3 of two of its horizontal and vertical neighbors 0
 0, 2, 8, 127, 3686, 285929, 47398400, 18127384939, 15993244772677, 32531416116323498, 152344987111028997103, 1640044640940871976733780 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE Some solutions for 4X4 ..1..2..1..2....1..2..2..1....1..2..0..0....1..1..1..1....1..2..1..1 ..2..2..1..2....2..2..1..2....2..2..1..0....1..1..1..1....2..2..1..1 ..1..1..1..2....2..1..1..2....0..1..2..2....1..1..1..0....1..1..1..1 ..2..2..2..1....1..2..2..1....0..0..2..1....1..1..0..0....1..1..1..1 CROSSREFS Sequence in context: A271846 A009360 A202648 * A156497 A064205 A081856 Adjacent sequences:  A193478 A193479 A193480 * A193482 A193483 A193484 KEYWORD nonn AUTHOR R. H. Hardin Jul 27 2011 STATUS approved

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Last modified July 5 15:05 EDT 2022. Contains 355099 sequences. (Running on oeis4.)