A278324 Number of nX7 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.

56, 4991, 251892, 11947350, 570738085, 26606146271, 1159826452573, 46588303100299, 1741053359883624, 61687083048618477, 2105403821298913363, 69685735738121699248, 2231675758500253736280, 68674888544867993485304

Offset

1,1

Comments

Column 7 of A278325.

Links

R. H. Hardin, Table of n, a(n) for n = 1..79

Example

Some solutions for n=2
..1..0..1..1..0..0..0. .0..0..1..1..1..0..0. .0..0..1..1..1..1..0
..1..1..0..1..1..1..1. .0..0..0..0..1..0..0. .1..1..1..0..0..0..0

Crossrefs

Cf. A278325.

Sequence in context: A271138 A271139 A271140 * A009600 A278777 A202565

Adjacent sequences: A278321 A278322 A278323 * A278325 A278326 A278327

Keyword

nonn

Author

R. H. Hardin, Nov 18 2016

Status

approved