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A266905
Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west or southwest neighbor modulo 3 and the upper left element equal to 0.
2
1, 1, 5, 11, 24, 77, 222, 700, 2297, 6869, 21609, 71873, 232180, 750378, 2467891, 8112639, 26801830, 89117472, 296172168, 986748556, 3302475620, 11072842433, 37184910085, 125141998479, 421837425707, 1424270565702, 4816739871914
OFFSET
1,3
COMMENTS
Row 3 of A266904.
LINKS
EXAMPLE
Some solutions for n=6
..0..0..0..2..2..1....0..2..1..0..2..2....0..2..1..1..0..2....0..2..1..0..0..2
..0..0..2..2..1..1....2..1..0..0..2..1....0..2..1..1..0..2....2..1..1..0..2..1
..0..2..2..1..1..1....1..0..0..2..1..1....0..2..1..1..0..2....2..1..0..2..1..0
CROSSREFS
Cf. A266904.
Sequence in context: A122926 A122925 A021008 * A059358 A296911 A167238
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 05 2016
STATUS
approved