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A230268 Number of n X n 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero 0
0, 0, 28, 5734, 5524854, 28716109350, 810027275568580, 124090541934393885346 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A230275

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A131315 A200999 A221935 * A203328 A159407 A099058

Adjacent sequences:  A230265 A230266 A230267 * A230269 A230270 A230271

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 14 2013

STATUS

approved

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Last modified May 21 05:37 EDT 2022. Contains 353889 sequences. (Running on oeis4.)