A223628 - OEIS

A223628

Number of 4Xn 0..1 arrays with row sums nondecreasing and column sums unimodal

5, 57, 574, 5303, 45580, 371569, 2888847, 21682470, 157890604, 1122989213, 7823305028, 53616424319, 362154769507, 2417927626645, 15974816173984, 104654549193585, 680333442419474, 4395052276257145, 28227767989525125

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Row 4 of A223625

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..39

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A218658 A266278 A103047 * A107339 A139260 A114466

Adjacent sequences: A223625 A223626 A223627 * A223629 A223630 A223631

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2013

STATUS

approved