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A269046 Number of nXn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once. 1
3, 42, 594, 24192, 1643376, 242861616, 71430596250, 43961616939276, 56121206116838532, 149312689805356303800, 836315757545942679945480, 9777884421682321788379713444, 242268002268280142077867206348378 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A269052.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..14

EXAMPLE

Some solutions for n=4

..2..0..1..2. .1..2..1..2. .0..2..1..0. .2..2..2..2. .0..2..1..2

..1..2..1..0. .1..2..1..0. .1..0..1..0. .1..1..2..2. .1..0..1..2

..1..2..1..0. .1..0..1..0. .0..0..0..0. .2..2..2..1. .0..0..1..0

..1..0..1..0. .1..2..0..0. .0..0..0..1. .1..2..2..2. .0..0..1..0

CROSSREFS

Cf. A269052.

Sequence in context: A173936 A219619 A097068 * A092470 A206820 A157542

Adjacent sequences:  A269043 A269044 A269045 * A269047 A269048 A269049

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 18 2016

STATUS

approved

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Last modified October 18 00:15 EDT 2019. Contains 328135 sequences. (Running on oeis4.)