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 A266852 Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its north, west, northeast or southeast neighbor modulo n and the upper left element equal to 0. 0
 1, 0, 1, 6, 171, 7637, 597012, 61297802, 8302773834, 1419843626102, 298978224319607 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Column 2 of A266854. LINKS EXAMPLE Some solutions for n=5 ..0..2....0..2....0..4....0..0....0..4....0..4....0..0....0..4....0..0....0..3 ..0..2....4..1....4..2....3..2....3..2....4..3....4..3....4..2....4..2....2..1 ..4..1....3..1....2..1....1..1....2..1....3..2....1..1....1..1....1..4....0..4 ..1..4....3..0....0..3....4..4....4..3....2..1....4..3....0..3....3..3....4..3 ..3..3....2..4....3..1....3..2....1..0....1..0....2..2....3..2....2..1....2..1 CROSSREFS Cf. A266854. Sequence in context: A198176 A264358 A264796 * A266311 A323820 A317795 Adjacent sequences:  A266849 A266850 A266851 * A266853 A266854 A266855 KEYWORD nonn AUTHOR R. H. Hardin, Jan 04 2016 STATUS approved

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Last modified June 26 06:36 EDT 2022. Contains 354877 sequences. (Running on oeis4.)