A278323 Number of nX6 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.

21, 1492, 51229, 1548002, 43798840, 1133034160, 26606146271, 577253086055, 11856994168275, 234252250004719, 4462457602929707, 81437338008292870, 1411665474225016752, 23098384621606953307, 355699829714059120732

Offset

1,1

Comments

Column 6 of A278325.

Links

R. H. Hardin, Table of n, a(n) for n = 1..150

Example

Some solutions for n=3
..0..1..0..1..1..0. .0..1..0..1..0..1. .0..0..0..1..1..1. .0..1..0..1..1..1
..1..0..1..0..1..1. .0..1..1..0..1..0. .0..1..1..1..1..1. .1..0..0..1..0..0
..1..1..0..0..1..0. .1..0..1..1..0..1. .1..1..0..1..1..0. .1..0..0..1..0..1

Crossrefs

Cf. A278325.

Sequence in context: A118446 A130332 A035319 * A301432 A220561 A239267

Adjacent sequences: A278320 A278321 A278322 * A278324 A278325 A278326

Keyword

nonn

Author

R. H. Hardin, Nov 18 2016

Status

approved