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A266468
Number of nX6 binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.
0
2, 8, 39, 261, 2090, 18808, 175180, 1595005, 13720886, 109830369, 814603355, 5605474331, 35922351069, 215377645103, 1213816837380, 6458765687442, 32580784869691, 156385330035183, 716642920656832
OFFSET
1,1
COMMENTS
Column 6 of A266470.
EXAMPLE
Some solutions for n=4
..0..0..0..0..0..1....0..0..0..1..1..1....0..0..0..0..0..1....0..1..1..1..1..1
..0..0..0..0..1..0....1..1..1..0..0..0....0..0..1..1..1..0....1..0..0..1..1..1
..1..1..1..1..0..0....1..1..1..0..0..0....1..1..0..0..0..0....1..0..1..0..0..0
..1..1..1..1..1..1....1..1..1..0..0..0....1..1..1..1..1..0....1..1..0..0..0..0
CROSSREFS
Cf. A266470.
Sequence in context: A307709 A217945 A091073 * A326963 A306781 A154132
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2015
STATUS
approved