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A266080
Number of nX7 integer arrays with each element equal to the number of horizontal and vertical neighbors differing from itself by exactly one.
1
1, 1, 10, 23, 55, 146, 466, 1155, 3364, 9229, 25566, 70308, 196647, 544696, 1527557, 4229863, 11872589, 32954820, 92269343, 256481433, 718070373, 1997666638, 5589444252, 15558565416, 43515994717, 121194482007, 338915914513
OFFSET
1,3
COMMENTS
Column 7 of A266081.
LINKS
EXAMPLE
Some solutions for n=4
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..2..3..2
..2..3..2..2..3..2..0....0..0..2..3..2..0..0....0..0..0..0..3..4..3
..3..4..3..3..4..3..0....0..0..3..4..3..0..0....0..0..0..0..2..3..2
..2..3..2..2..3..2..0....0..0..2..3..2..0..0....0..0..0..0..0..0..0
CROSSREFS
Cf. A266081.
Sequence in context: A072245 A135277 A156202 * A316093 A262485 A219940
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 20 2015
STATUS
approved