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A266656
Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its northeast neighbor modulo 3 and the upper left element equal to 0.
2
2, 11, 91, 829, 8013, 80497, 830673, 8743293, 93437237, 1010633645, 11038556349, 121547316675, 1347523434675, 15026262949575, 168400839231879, 1895558909938005, 21419116890326757, 242855221965797157
OFFSET
1,1
COMMENTS
Row 3 of A266655.
LINKS
EXAMPLE
Some solutions for n=4
..0..1..1..2....0..2..2..0....0..2..1..1....0..1..2..1....0..0..0..2
..0..0..1..2....2..2..0..1....2..1..0..0....0..2..0..1....2..2..2..1
..2..1..2..0....1..0..1..1....1..2..0..2....2..2..0..1....1..1..1..0
CROSSREFS
Cf. A266655.
Sequence in context: A138552 A258221 A004677 * A094955 A352292 A143870
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 02 2016
STATUS
approved