A223621 Number of nX3 0..1 arrays with row sums nondecreasing and column sums unimodal

7, 35, 147, 574, 2114, 7504, 26050, 88627, 296989, 985303, 3236269, 10543598, 34156986, 109995484, 352428398, 1125103059, 3577593997, 11336743971, 35833521825, 112944171696, 355097604934, 1114357838268, 3489662154182

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