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A266466 Number of nX4 binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing. 1
2, 6, 19, 66, 232, 794, 2574, 7797, 22058, 58469, 146027, 345578, 779240, 1682359, 3492869, 6999952, 13585959, 25610002, 47004982, 84187248, 147421139, 252829908, 425319569, 702767285, 1141951244, 1826839569, 2880058656, 4478585700 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A266470.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..67

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A266470.

Sequence in context: A275755 A150085 A306175 * A005654 A150086 A150087

Adjacent sequences:  A266463 A266464 A266465 * A266467 A266468 A266469

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2015

STATUS

approved

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Last modified October 20 23:39 EDT 2018. Contains 316405 sequences. (Running on oeis4.)