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A230818
Number of nX7 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 at least one element with value (x(i,j)-1) mod 3, and upper left element zero
0
0, 18, 2114, 108006, 10872238, 888633610, 75341251814, 6484756891722, 546028214903014
OFFSET
1,2
COMMENTS
Column 7 of A230819
EXAMPLE
Some solutions for n=4
..0..2..1..0..1..0..2....0..2..1..0..2..0..1....0..2..1..0..0..2..1
..1..1..0..2..2..0..1....1..2..0..1..1..0..2....1..0..2..2..1..2..0
..2..0..1..1..2..0..1....2..0..1..2..0..0..1....2..2..1..0..2..1..1
..0..1..2..0..1..0..2....1..0..2..0..1..2..0....0..1..2..0..1..0..2
CROSSREFS
Sequence in context: A068181 A296614 A341842 * A276017 A178630 A136834
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 30 2013
STATUS
approved