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A269195 Number of n X n 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three no more than once. 0
4, 180, 25572, 15289548, 34838403756, 320994710282892, 12093315071771856492, 1887658657444603460395332, 1230222115345954315761363474780, 3366670969596963372379333414861881876 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A269201.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

..0..2..0. .0..1..0. .3..1..3. .0..0..1. .1..0..0. .3..1..2. .0..0..0

..0..1..3. .1..1..1. .0..3..3. .0..0..1. .1..0..1. .3..2..0. .2..0..0

..0..1..3. .3..1..3. .3..1..1. .0..1..0. .3..3..1. .2..2..0. .2..0..1

CROSSREFS

Cf. A269201.

Sequence in context: A176351 A330771 A263436 * A269102 A240282 A278693

Adjacent sequences:  A269192 A269193 A269194 * A269196 A269197 A269198

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 20 2016

STATUS

approved

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Last modified April 18 05:44 EDT 2021. Contains 343072 sequences. (Running on oeis4.)