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A278675 Number of nX7 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake. 1
56, 1050, 12727, 134265, 1378241, 14437336, 157706284, 1809189550, 21622163723, 263667893290, 3200723946503, 37898709431669, 431935945421546, 4704720632893357, 48828296440609470, 482618940316582616 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A278676.
LINKS
EXAMPLE
Some solutions for n=4
..1..1..1..1..0..0..0. .1..0..0..0..0..0..0. .0..0..0..0..0..1..1
..0..0..0..0..1..1..0. .1..1..1..1..1..1..0. .1..0..0..0..0..1..0
..1..0..0..0..0..0..0. .0..1..0..0..0..0..0. .1..1..0..0..0..0..1
..1..1..0..0..1..1..1. .0..1..1..1..1..0..1. .1..1..1..1..1..1..0
CROSSREFS
Cf. A278676.
Sequence in context: A252181 A251432 A243206 * A114059 A221802 A219583
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 25 2016
STATUS
approved

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Last modified June 24 09:58 EDT 2024. Contains 373674 sequences. (Running on oeis4.)