A278850 Number of nX3 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes.

0, 1, 66, 1348, 15066, 118158, 731444, 3813048, 17413532, 71497004, 268726051, 936836634, 3059698312, 9435007950, 27642602449, 77344108820, 207567987387, 536252189264, 1337891704776, 3232242731921, 7579822554305, 17290405684287

Offset

1,3

Comments

Column 3 of A278855.

Links

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

R. H. Hardin, Empirical polynomial of degree 27

Formula

Empirical polynomial of degree 27 (see link above)

Example

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

Crossrefs

Cf. A278855.

Sequence in context: A231287 A263522 A269693 * A104673 A251047 A279889

Adjacent sequences: A278847 A278848 A278849 * A278851 A278852 A278853

Keyword

nonn

Author

R. H. Hardin, Nov 29 2016

Status

approved