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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

R. H. Hardin, Table of n, a(n) for n = 1..81

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

Adjacent sequences:  A278672 A278673 A278674 * A278676 A278677 A278678

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 25 2016

STATUS

approved

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Last modified February 20 23:24 EST 2019. Contains 320362 sequences. (Running on oeis4.)