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 A265677 Number of nX2 arrays containing 2 copies of 0..n-1 with no equal vertical or antidiagonal neighbors and new values introduced sequentially from 0. 0
 1, 1, 4, 23, 209, 2301, 29992, 450525, 7666097, 145748085, 3062086652, 70451319403, 1761725152737, 47575849111097, 1379912569740752, 42782608276446713, 1411969570132526241, 49423093937535984041 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Column 2 of A265679. LINKS EXAMPLE Some solutions for n=4 ..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1 ..2..0....2..3....2..0....2..2....2..3....2..0....2..0....2..2....2..3....2..2 ..3..2....1..0....3..3....1..0....1..0....3..3....1..2....3..3....0..2....3..3 ..1..3....3..2....2..1....3..3....2..3....1..2....3..3....0..1....1..3....1..0 CROSSREFS Cf. A265679. Sequence in context: A222454 A336948 A099869 * A221371 A056785 A188404 Adjacent sequences:  A265674 A265675 A265676 * A265678 A265679 A265680 KEYWORD nonn AUTHOR R. H. Hardin, Dec 13 2015 STATUS approved

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Last modified April 21 23:52 EDT 2021. Contains 343156 sequences. (Running on oeis4.)