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A266474 Number of 7Xn binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing. 1
8, 42, 303, 2574, 22128, 175180, 1231170, 7652503, 42460424, 212971589, 977395362, 4147719749, 16420984346, 61103700814, 215040758842, 719522481940, 2299243641848, 7043942786447, 20758083457211, 59015575393057 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A266470.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical polynomial of degree 34

FORMULA

Empirical polynomial of degree 34 (see link above)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

CROSSREFS

Cf. A266470.

Sequence in context: A047772 A204565 A020068 * A238723 A316283 A236328

Adjacent sequences: A266471 A266472 A266473 * A266475 A266476 A266477

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2015

STATUS

approved

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Last modified December 1 08:58 EST 2022. Contains 358467 sequences. (Running on oeis4.)