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A267249 Number of 6Xn binary arrays with row sums nondecreasing and columns lexicographically nondecreasing. 0
7, 127, 1685, 20676, 220235, 2093467, 17892539, 139164323, 993947185, 6572368601, 40512935649, 234192144667, 1276154088792, 6584891361478, 32302298031855, 151176059240006 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A267245.

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A267245.

Sequence in context: A255954 A278791 A064754 * A025166 A241955 A139291

Adjacent sequences:  A267246 A267247 A267248 * A267250 A267251 A267252

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 12 2016

STATUS

approved

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Last modified April 14 22:47 EDT 2021. Contains 342971 sequences. (Running on oeis4.)