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A266546 Number of nX7 binary arrays with rows and columns lexicographically nondecreasing and row and column sums nonincreasing. 0
2, 5, 13, 36, 110, 366, 1688, 5312, 24921, 101495, 417118, 1673507, 6081357, 22843019, 72935735, 238112928, 734665224, 2185350505 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A266547.

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Cf. A266547.

Sequence in context: A135335 A066723 A000994 * A271272 A148296 A148297

Adjacent sequences:  A266543 A266544 A266545 * A266547 A266548 A266549

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 31 2015

STATUS

approved

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Last modified July 24 05:21 EDT 2019. Contains 325290 sequences. (Running on oeis4.)