A268782 Number of n X n binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once.

0, 5, 72, 1714, 67100, 4725018, 611932378, 148013550916, 67580406047498, 58605374440440754, 97015414668307967168, 307604236621005318739500, 1873151902121241161650454526, 21951627197224261891003815976598

Offset

1,2

Comments

Diagonal of A268789.

Links

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

Example

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

Crossrefs

Cf. A268789.

Sequence in context: A186664 A223128 A079340 * A282788 A197324 A197977

Adjacent sequences: A268779 A268780 A268781 * A268783 A268784 A268785

Keyword

nonn

Author

R. H. Hardin, Feb 13 2016

Status

approved