A268743 Number of n X n binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.

2, 11, 143, 4110, 255651, 34732937, 10319681062, 6744840113811, 9736268648482947, 31152408949342676906, 221573405414594347811555, 3511390061199964238627005057, 124222798189336185449669887550302

Offset

1,1

Comments

Diagonal of A268750.

Links

R. H. Hardin, Table of n, a(n) for n = 1..26

Example

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

Crossrefs

Cf. A268750.

Sequence in context: A113148 A377894 A193209 * A348797 A204243 A203203

Adjacent sequences: A268740 A268741 A268742 * A268744 A268745 A268746

Keyword

nonn

Author

R. H. Hardin, Feb 12 2016

Status

approved