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A278673 Number of nX5 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake. 1
20, 245, 1801, 10584, 55854, 280616, 1378241, 6654535, 31404174, 143558071, 630909284, 2653428584, 10658877991, 40894491453, 150023824702, 527191888255, 1778244684147, 5769938709484, 18048492750432, 54537766679216 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A278676.
LINKS
FORMULA
Empirical polynomial of degree 37 (see link above)
EXAMPLE
Some solutions for n=4
..0..0..1..1..0. .1..1..1..0..0. .0..0..1..1..0. .0..0..0..1..0
..1..1..1..1..0. .1..0..0..0..0. .0..0..1..1..1. .0..0..0..1..0
..1..1..1..1..0. .1..0..0..0..0. .1..0..1..1..1. .1..1..0..1..1
..1..1..1..1..1. .1..1..0..0..0. .1..1..0..0..0. .1..1..1..1..1
CROSSREFS
Cf. A278676.
Sequence in context: A140124 A123954 A125432 * A055757 A022744 A081143
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 25 2016
STATUS
approved

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Last modified June 17 20:03 EDT 2024. Contains 373464 sequences. (Running on oeis4.)