A278356 Number of n X n 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly one mistake.

0, 6, 142, 4872, 366982, 72941420, 41820621848, 72690257629470, 395626151337242078, 6904547033525030005268

Offset

1,2

Comments

Diagonal of A278363.

Links

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

Example

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

Crossrefs

Cf. A278363.

Sequence in context: A286446 A048863 A363989 * A277419 A349069 A111839

Adjacent sequences: A278353 A278354 A278355 * A278357 A278358 A278359

Keyword

nonn

Author

R. H. Hardin, Nov 19 2016

Status

approved