A278318 Number of n X n 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.

0, 3, 236, 19854, 3058990, 1133034160, 1159826452573, 3539023342110534, 33693644340398789900, 1032075934040317150939325

Offset

1,2

Comments

Diagonal of A278325.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A278325.

Sequence in context: A299064 A299836 A299725 * A103062 A157723 A342631

Adjacent sequences: A278315 A278316 A278317 * A278319 A278320 A278321

Keyword

nonn

Author

R. H. Hardin, Nov 18 2016

Status

approved