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A269005 Number of n X n binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once. 1
0, 4, 46, 2136, 109058, 14382480, 3258530608, 1582785864320, 1554970236400402, 3055129067325800608, 12891237725516640144940, 106775629834644247372248448, 1932363567303596958505554161216, 68821810412730939070416537380998580 (list; graph; refs; listen; history; text; internal format)
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

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Last modified August 14 13:57 EDT 2020. Contains 336481 sequences. (Running on oeis4.)