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A223621 Number of nX3 0..1 arrays with row sums nondecreasing and column sums unimodal 1
7, 35, 147, 574, 2114, 7504, 26050, 88627, 296989, 985303, 3236269, 10543598, 34156986, 109995484, 352428398, 1125103059, 3577593997, 11336743971, 35833521825, 112944171696, 355097604934, 1114357838268, 3489662154182 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A223625

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..84

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A240418 A211843 A121163 * A215510 A240423 A094825

Adjacent sequences:  A223618 A223619 A223620 * A223622 A223623 A223624

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2013

STATUS

approved

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Last modified May 25 03:39 EDT 2022. Contains 354047 sequences. (Running on oeis4.)