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A208778
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Number of n X 6 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 1 and 1 1 1 vertically.
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1
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26, 676, 156, 260, 416, 676, 1092, 1768, 2860, 4628, 7488, 12116, 19604, 31720, 51324, 83044, 134368, 217412, 351780, 569192, 920972, 1490164, 2411136, 3901300, 6312436, 10213736, 16526172, 26739908, 43266080, 70005988, 113272068
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = a(n-1) + a(n-2) for n>4.
Empirical g.f.: 26*x*(1 + 25*x - 21*x^2 - 22*x^3) / (1 - x - x^2). - Colin Barker, Jul 06 2018
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EXAMPLE
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Some solutions for n=4:
0 1 0 1 0 0 0 1 0 1 1 0 0 1 0 1 0 1 1 0 1 0 1 1
1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 0 1 0 1 0 0
0 1 0 1 0 1 0 1 0 1 0 0 0 1 0 1 0 0 1 0 1 0 1 1
1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 1 0 1 0 1 0 0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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