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 A266630 Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its north, west, southeast or southwest neighbor modulo n and the upper left element equal to 0. 0
 1, 0, 1, 13, 139, 7623, 585112, 60695930, 8247622671, 1413690625856, 298076685938894 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Column 2 of A266632. LINKS EXAMPLE Some solutions for n=4 ..0..2....0..3....0..2....0..2....0..2....0..2....0..2....0..3....0..2....0..3 ..2..0....3..1....3..1....0..2....0..2....2..0....2..1....3..2....3..2....0..2 ..1..3....2..1....2..0....3..1....3..1....1..3....1..3....2..1....3..1....2..1 ..1..3....2..0....1..3....3..1....1..3....3..1....0..3....1..0....1..0....1..3 CROSSREFS Cf. A266632. Sequence in context: A193708 A195464 A064103 * A186506 A051639 A138931 Adjacent sequences:  A266627 A266628 A266629 * A266631 A266632 A266633 KEYWORD nonn AUTHOR R. H. Hardin, Jan 01 2016 STATUS approved

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Last modified October 17 12:25 EDT 2019. Contains 328112 sequences. (Running on oeis4.)