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A222840
Number of nX3 0..3 arrays with no more than floor(nX3/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order
1
2, 105, 4797, 326408, 15364848, 1077545438, 52487425596, 3689615795056, 182579365380505, 12856303224433084, 643621625467714042, 45333053732314073754, 2288743268254953421250, 161184278096856509113288
OFFSET
1,1
COMMENTS
Column 3 of A222842
LINKS
EXAMPLE
Some solutions for n=3
..0..1..2....0..1..1....0..1..2....0..0..1....0..1..0....0..1..0....0..1..1
..1..2..1....2..2..3....1..3..1....2..0..0....2..2..1....2..3..3....2..0..3
CROSSREFS
Sequence in context: A156880 A280095 A229016 * A356723 A260579 A125593
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 06 2013
STATUS
approved