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A267250 Number of 7Xn binary arrays with row sums nondecreasing and columns lexicographically nondecreasing. 0
8, 255, 5804, 129129, 2499080, 43555569, 683027146, 9748574556, 127531124302, 1540596418525, 17291858116440, 181338323456395, 1785428392643952, 16575758386318547 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A267245.

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

CROSSREFS

Cf. A267245.

Sequence in context: A277421 A171612 A053717 * A034674 A317511 A300176

Adjacent sequences:  A267247 A267248 A267249 * A267251 A267252 A267253

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 12 2016

STATUS

approved

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Last modified April 10 18:04 EDT 2021. Contains 342852 sequences. (Running on oeis4.)