A278775 Number of nX5 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

6, 503, 10784, 150085, 1673658, 16205001, 141166787, 1126917480, 8340736743, 57745890265, 376707516550, 2329550843590, 13722943412752, 77304542920321, 417679484040714, 2169521229525151, 10853156575543255, 52367994237483811

Offset

1,1

Comments

Column 5 of A278778.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical polynomial of degree 69

Formula

Empirical polynomial of degree 69 (see link above)

Example

Some solutions for n=4
..0..0..1..1..0. .0..1..0..0..0. .0..0..0..0..0. .0..1..0..1..1
..1..1..1..1..1. .0..1..1..0..0. .0..0..0..0..1. .0..1..1..1..0
..0..0..1..0..1. .1..1..0..1..0. .0..1..1..0..0. .1..0..0..0..1
..1..0..0..0..0. .1..0..0..1..0. .1..1..1..1..1. .1..0..0..1..1

Crossrefs

Cf. A278778.

Sequence in context: A099057 A123278 A127605 * A013975 A272094 A103520

Adjacent sequences: A278772 A278773 A278774 * A278776 A278777 A278778

Keyword

nonn

Author

R. H. Hardin, Nov 28 2016

Status

approved