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A267661
Number of nX2 0..1 arrays with every repeated value in every row unequal to the previous repeated value, and in every column equal to the previous repeated value, and new values introduced in row-major sequential order.
1
2, 8, 32, 98, 288, 800, 2178, 5832, 15488, 40898, 107648, 282752, 741762, 1944392, 5094432, 13343778, 34944800, 91503392, 239586050, 627288200, 1642332672, 4299797378, 11257201152, 29472035328, 77159275778, 202006392200
OFFSET
1,1
COMMENTS
Column 2 of A267667.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) -2*a(n-2) -6*a(n-3) +4*a(n-4) +2*a(n-5) -a(n-6)
EXAMPLE
Some solutions for n=8
..0..1....0..1....0..1....0..1....0..0....0..1....0..1....0..0....0..0....0..1
..0..1....1..1....1..0....0..0....1..1....1..0....1..0....1..0....0..1....0..1
..0..1....1..1....0..1....1..0....0..0....0..1....1..0....0..0....1..0....0..1
..0..0....1..0....1..0....0..1....1..1....1..0....1..0....1..0....0..0....1..1
..1..1....1..1....0..0....1..0....1..1....0..1....1..1....0..1....0..0....0..0
..0..1....1..0....1..0....0..0....0..1....0..0....1..0....0..0....0..0....0..1
..0..1....1..1....1..1....0..0....1..1....0..1....0..0....1..1....1..0....0..0
..0..1....1..0....0..0....0..1....1..0....1..1....1..0....0..0....0..0....1..1
CROSSREFS
Cf. A267667.
Sequence in context: A212892 A302936 A227971 * A052481 A306292 A067897
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 19 2016
STATUS
approved