A269005 Number of n X n binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

0, 4, 46, 2136, 109058, 14382480, 3258530608, 1582785864320, 1554970236400402, 3055129067325800608, 12891237725516640144940, 106775629834644247372248448, 1932363567303596958505554161216, 68821810412730939070416537380998580

Offset

1,2

Comments

Diagonal of A269011.

Links

R. H. Hardin, Table of n, a(n) for n = 1..23

Example

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

Crossrefs

Cf. A269011.

Sequence in context: A113096 A135078 A195243 * A107766 A065777 A193485

Adjacent sequences: A269002 A269003 A269004 * A269006 A269007 A269008

Keyword

nonn

Author

R. H. Hardin, Feb 17 2016

Status

approved