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 A180837 Number of nX3 arrays containing 3 indistinguishable copies of 1..n with rows and columns in lexicographically strictly increasing order 0
 1, 1, 77, 5385, 545426, 79230924, 15755497776, 4122239926855 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Column 3 of A180839 LINKS EXAMPLE Some solutions for 3X3 ..1..1..2....1..1..2....1..1..2....1..1..2....1..1..2....1..1..2....1..1..2 ..1..2..3....1..2..2....1..2..3....1..2..3....1..3..2....1..3..3....1..3..3 ..2..3..3....3..3..3....3..3..2....3..2..3....2..3..3....2..3..2....2..2..3 ... ..1..1..2....1..1..2....1..1..2....1..1..3....1..1..3....1..1..3....1..1..3 ..1..3..2....1..3..2....1..3..3....1..2..2....1..2..3....1..2..3....1..2..2 ..3..3..2....3..2..3....3..2..2....2..3..3....2..3..2....2..2..3....3..3..2 ... ..1..1..3....1..1..3....1..1..3....1..1..3....1..1..3....1..1..3....1..1..1 ..1..2..2....1..2..3....1..3..2....1..3..2....1..3..3....1..3..2....2..2..3 ..3..2..3....3..2..2....2..3..2....2..2..3....2..2..2....3..2..2....2..3..3 ... ..1..1..2....1..1..2....1..1..2....1..1..2....1..1..2....1..1..2....1..1..2 ..2..3..1....2..3..1....2..3..1....2..3..2....2..3..2....2..3..3....2..3..3 ..2..3..3....3..3..2....3..2..3....3..3..1....3..1..3....3..1..2....3..2..1 CROSSREFS Sequence in context: A217455 A116319 A217962 * A210811 A107787 A099638 Adjacent sequences:  A180834 A180835 A180836 * A180838 A180839 A180840 KEYWORD nonn AUTHOR R. H. Hardin Sep 20 2010 STATUS approved

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Last modified July 4 20:08 EDT 2022. Contains 355086 sequences. (Running on oeis4.)