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A278777 Number of nX7 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes. 1
56, 5209, 189595, 5355983, 141166787, 3634987413, 90752836672, 2155380363189, 48042054699217, 999491681597761, 19416161058987737, 353517442918850559, 6065787121333416262, 98680235108923294584, 1531317900358396738494 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A278778.
LINKS
EXAMPLE
Some solutions for n=3
..1..0..1..1..0..0..0. .0..0..0..1..1..1..1. .1..1..0..0..1..0..0
..1..0..0..0..1..0..0. .0..1..0..1..0..0..0. .0..0..1..0..0..1..0
..1..0..0..0..1..0..0. .0..1..1..0..1..0..0. .1..1..0..1..0..0..1
CROSSREFS
Cf. A278778.
Sequence in context: A271140 A278324 A009600 * A202565 A213693 A180372
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 28 2016
STATUS
approved

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Last modified May 27 11:36 EDT 2024. Contains 372858 sequences. (Running on oeis4.)