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A230169 Number of n X n 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value 2-x(i,j) 0
0, 27, 3787, 4722977, 49754476927, 4381081731832923, 3274958849115023706081 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A230176

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A166750 A195374 A238698 * A271240 A223327 A211927

Adjacent sequences:  A230166 A230167 A230168 * A230170 A230171 A230172

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 11 2013

STATUS

approved

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Last modified July 28 14:19 EDT 2021. Contains 346335 sequences. (Running on oeis4.)