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A230903 Number of n X n 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero 0
0, 2, 38, 802, 30304, 2121666, 271505344, 63341237848, 26993178279216 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A230910

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A262585 A208240 A075796 * A246000 A266601 A266597

Adjacent sequences:  A230900 A230901 A230902 * A230904 A230905 A230906

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 01 2013

STATUS

approved

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Last modified April 3 00:35 EDT 2020. Contains 333195 sequences. (Running on oeis4.)