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A207686
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Number of 6Xn 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 1 1 vertically
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1
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18, 324, 660, 2032, 4728, 11994, 29982, 77141, 193184, 485658, 1213580, 3090430, 7754424, 19478100, 49010084, 123869662, 311515934, 782045058, 1972950126, 4972883946, 12497401442, 31449373036, 79304725202, 199577343966
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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) = 16*a(n-3) +25*a(n-4) +4*a(n-5) -98*a(n-6) -234*a(n-7) -159*a(n-8) +340*a(n-9) +928*a(n-10) +892*a(n-11) -875*a(n-12) -1506*a(n-13) -2035*a(n-14) +3226*a(n-15) -2346*a(n-16) +1152*a(n-17) -43*a(n-18) +16260*a(n-19) -19321*a(n-20) -39390*a(n-21) -10869*a(n-22) +83214*a(n-23) +110923*a(n-24) -32942*a(n-25) -118675*a(n-26) -208716*a(n-27) +112834*a(n-28) +157576*a(n-29) +235815*a(n-30) -383014*a(n-31) -129416*a(n-32) -167256*a(n-33) +702566*a(n-34) +41228*a(n-35) +292854*a(n-36) -833688*a(n-37) -67215*a(n-38) -378998*a(n-39) +539836*a(n-40) +97752*a(n-41) +263889*a(n-42) -84830*a(n-43) -1390*a(n-44) -99950*a(n-45) -12152*a(n-46) -107340*a(n-47) +13773*a(n-48) -76994*a(n-49) +69895*a(n-50) +34412*a(n-51) +98890*a(n-52) +21902*a(n-53) -42482*a(n-54) -69658*a(n-55) -40323*a(n-56) +13658*a(n-57) +27149*a(n-58) +14106*a(n-59) -1443*a(n-60) -7676*a(n-61) -2105*a(n-62) +14*a(n-63) +729*a(n-64) +220*a(n-65) -110*a(n-66) for n>72
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EXAMPLE
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Some solutions for n=4
..1..0..0..1....0..1..0..0....1..0..0..1....1..1..1..1....0..1..0..0
..0..1..1..0....0..1..1..0....1..1..1..1....1..1..0..0....0..0..1..0
..1..1..0..0....0..0..1..0....0..0..1..0....0..0..1..1....0..1..0..0
..0..0..1..0....0..1..0..0....0..1..0..0....1..0..0..1....0..1..1..0
..0..1..1..0....0..0..1..0....0..1..1..0....0..0..1..0....0..0..1..0
..0..1..0..0....0..0..1..0....0..0..1..0....1..0..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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