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 A224125 Number of 3Xn 0..3 arrays with row sums nondecreasing and column sums unimodal 1
 20, 1080, 47059, 1703178, 53355889, 1491827492, 38051383139, 899713542225, 19963535397227, 419672473818646, 8421847090410941, 162325525523034609, 3020162740527368685, 54468878788851494328, 955569173872191005683 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 3 of A224123 LINKS R. H. Hardin, Table of n, a(n) for n = 1..21 EXAMPLE Some solutions for n=3 ..0..2..3....2..1..0....2..2..1....0..2..1....1..0..1....0..2..3....0..1..2 ..1..2..2....2..3..0....0..3..2....2..1..3....2..2..2....0..3..2....2..3..0 ..2..2..3....1..3..1....1..2..2....2..1..3....1..2..3....3..0..2....0..3..3 CROSSREFS Sequence in context: A138915 A006427 A072962 * A324416 A177596 A210835 Adjacent sequences:  A224122 A224123 A224124 * A224126 A224127 A224128 KEYWORD nonn AUTHOR R. H. Hardin Mar 31 2013 STATUS approved

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Last modified July 4 16:26 EDT 2022. Contains 355081 sequences. (Running on oeis4.)