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A207985
Number of nX4 0..2 arrays avoiding the pattern z z+1 z horizontally and z z-1 z vertically
1
69, 4761, 244325, 12271227, 622569385, 31638012071, 1607243845009, 81641053794111, 4147075467417469, 210658289444343157, 10700760566367351027, 543563676726218129663, 27611262828599058482901, 1402562262828848350945747
OFFSET
1,1
COMMENTS
Column 4 of A207989
LINKS
EXAMPLE
Some solutions for n=4
..0..2..2..2....0..2..0..0....0..2..0..1....2..0..0..0....2..2..1..2
..1..1..0..2....0..1..2..0....2..0..1..1....0..1..1..0....2..1..0..0
..2..0..1..1....1..0..2..0....0..2..1..1....0..1..1..2....1..1..2..0
..1..2..0..0....0..2..1..2....2..0..0..1....2..2..0..1....0..1..2..2
CROSSREFS
Sequence in context: A206953 A206730 A207354 * A207197 A207217 A296785
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 22 2012
STATUS
approved