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A267426
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any west, northeast or northwest neighbors modulo 4 and the upper left element equal to 0.
1
6, 1, 1, 1, 1, 1, 1, 5, 27, 147, 716, 3088, 11526, 39526, 124957, 373857, 1064784, 2933131, 7873273, 20899636, 55550356, 150499069, 422235945, 1241600062, 3831289921, 12297881055, 40444127432, 134225228520, 444175261116
OFFSET
1,1
COMMENTS
Row 4 of A267425.
LINKS
EXAMPLE
Some solutions for n=9
..0..0..1..1..1..2..2..3..3....0..0..0..1..1..2..2..3..3
..0..1..1..2..2..2..3..3..0....0..1..1..1..2..2..3..3..3
..1..1..2..2..3..3..3..0..0....1..1..1..2..2..3..3..0..0
..1..2..2..3..3..0..0..0..1....1..2..2..2..3..3..0..0..0
CROSSREFS
Cf. A267425.
Sequence in context: A348039 A143532 A348947 * A202917 A324396 A234959
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 14 2016
STATUS
approved