A278669 Number of n X n 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.

0, 8, 158, 2650, 55854, 1998526, 157706284, 32788533228, 19802007716084, 36574110002226508

Offset

1,2

Comments

Diagonal of A278676.

Links

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

Example

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

Crossrefs

Cf. A278676.

Sequence in context: A211043 A025605 A114223 * A201030 A127369 A364741

Adjacent sequences: A278666 A278667 A278668 * A278670 A278671 A278672

Keyword

nonn

Author

R. H. Hardin, Nov 25 2016

Status

approved