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A223468
Number of nX2 0..2 arrays with no more than floor(nX2/2) elements equal to at least one king-move neighbor, with new values introduced in row major 0..2 order
1
1, 6, 18, 58, 140, 352, 776, 1752, 3696, 7904, 16288, 33824, 68800, 140544, 283776, 574336, 1154816, 2324992, 4663808, 9361920, 18754560, 37584896, 75237376, 150640640, 301428736, 603217920, 1206755328, 2414288896, 4829265920
OFFSET
1,2
COMMENTS
Column 2 of A223473
LINKS
EXAMPLE
Some solutions for n=4
..0..1....0..1....0..1....0..0....0..1....0..1....0..1....0..1....0..1....0..1
..2..2....2..2....2..2....1..2....2..2....1..2....1..2....2..2....2..0....2..2
..0..1....0..0....1..1....0..0....0..2....1..0....0..0....0..1....1..0....1..2
..2..0....1..2....2..0....2..1....2..1....2..1....2..1....2..2....2..0....2..0
CROSSREFS
Sequence in context: A363517 A227809 A119106 * A223211 A334330 A144706
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 20 2013
STATUS
approved