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A230463 Number of n X n 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero 0
0, 0, 114, 76518, 281740616, 8449174734112, 1929668277796729476, 3350063281301654212261806 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A230469

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A178409 A239654 A200577 * A200807 A084877 A060309

Adjacent sequences:  A230460 A230461 A230462 * A230464 A230465 A230466

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 20 2013

STATUS

approved

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Last modified July 28 12:39 EDT 2017. Contains 289889 sequences.