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A223622 Number of nX4 0..1 arrays with row sums nondecreasing and column sums unimodal 1
11, 98, 751, 5303, 35413, 228401, 1437511, 8898472, 54437857, 330381980, 1993659689, 11985196268, 71858499637, 430123654878, 2571650477297, 15366254287831, 91781204372957, 548141570513665, 3273511579537537 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A223625

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..28

EXAMPLE

Some solutions for n=3

..1..1..0..1....0..0..0..1....0..0..0..0....0..0..1..0....0..1..0..0

..1..0..1..1....0..1..1..0....0..0..0..0....0..0..1..0....1..1..1..1

..1..1..1..0....1..1..1..1....1..1..0..0....1..1..0..1....1..1..1..1

CROSSREFS

Sequence in context: A016140 A138930 A106136 * A130886 A239486 A015671

Adjacent sequences:  A223619 A223620 A223621 * A223623 A223624 A223625

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2013

STATUS

approved

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Last modified June 29 05:44 EDT 2022. Contains 354910 sequences. (Running on oeis4.)