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 A266865 Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its west or northeast neighbor modulo n and the upper left element equal to 0. 0
 1, 0, 4, 72, 2760, 154240, 12199500, 1293877704, 177333949072, 30510421277760, 6439108605861780, 1635806769641077000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Column 2 of A266867. LINKS EXAMPLE Some solutions for n=4 ..0..0....0..2....0..2....0..3....0..2....0..3....0..2....0..3....0..2....0..3 ..2..1....0..2....1..1....3..1....0..3....2..1....0..3....2..2....1..0....2..1 ..3..1....1..3....3..2....0..2....2..1....1..0....2..1....1..1....3..2....3..2 ..3..2....1..3....0..3....2..1....1..3....3..2....3..1....0..3....1..3....1..0 CROSSREFS Cf. A266867. Sequence in context: A203264 A295383 A309980 * A327882 A003718 A012947 Adjacent sequences:  A266862 A266863 A266864 * A266866 A266867 A266868 KEYWORD nonn AUTHOR R. H. Hardin, Jan 04 2016 STATUS approved

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Last modified December 3 14:51 EST 2020. Contains 338906 sequences. (Running on oeis4.)