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

Author

R. H. Hardin, Nov 18 2016

Keywords

• nonn

Comments

Column 7 of A278325.

Examples

			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
		

Links

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

Crossrefs

Cf. A278325.