A278675 Number of nX7 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.

56, 1050, 12727, 134265, 1378241, 14437336, 157706284, 1809189550, 21622163723, 263667893290, 3200723946503, 37898709431669, 431935945421546, 4704720632893357, 48828296440609470, 482618940316582616

Offset

1,1

Comments

Column 7 of A278676.

Links

R. H. Hardin, Table of n, a(n) for n = 1..81

Example

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

Crossrefs

Cf. A278676.

Sequence in context: A252181 A251432 A243206 * A114059 A221802 A219583

Adjacent sequences: A278672 A278673 A278674 * A278676 A278677 A278678

Keyword

nonn

Author

R. H. Hardin, Nov 25 2016

Status

approved