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A267743
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any west or northeast neighbors modulo 4 and the upper left element equal to 0.
1
6, 5, 26, 123, 633, 3428, 18899, 106599, 618585, 3674665, 22190640, 135570897, 835884024, 5196879659, 32568136350, 205609418532, 1306436325774, 8346088687406, 53563228719519, 345155128538327, 2232566289999786
OFFSET
1,1
COMMENTS
Row 4 of A267742.
LINKS
EXAMPLE
Some solutions for n=4
..0..1..2..3....0..0..0..0....0..1..2..2....0..0..1..2....0..1..2..3
..2..2..3..0....1..1..1..2....2..3..3..0....1..2..2..3....2..3..0..1
..2..3..0..1....1..2..2..3....3..0..1..1....3..3..0..1....0..0..1..2
..3..0..1..1....2..3..3..3....0..1..2..3....0..1..2..3....1..2..3..3
CROSSREFS
Cf. A267742.
Sequence in context: A228969 A256961 A371253 * A298155 A219931 A296192
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 20 2016
STATUS
approved