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A222839
Number of nX2 0..3 arrays with no more than floor(nX2/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order
2
1, 8, 105, 1585, 23107, 353631, 5338646, 81874696, 1252153841, 19270376854, 296641979113, 4580055753005, 70780702170260, 1095722113681548, 16978656325074532, 263390892198118920, 4089414898741050209
OFFSET
1,2
COMMENTS
Column 2 of A222842
LINKS
EXAMPLE
Some solutions for n=3
..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..0
..2..3....1..2....1..0....2..3....2..3....2..3....2..0....0..0....2..2....1..2
..1..3....2..3....0..1....0..3....1..0....3..1....0..1....2..1....2..3....2..0
CROSSREFS
Sequence in context: A239400 A001922 A264014 * A113551 A082735 A024358
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 06 2013
STATUS
approved