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A207066
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Number of nX6 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically
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1
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21, 441, 2499, 8799, 23856, 54684, 111426, 208026, 362943, 599907, 948717, 1446081, 2136498, 3073182, 4319028, 5947620, 8044281, 10707165, 14048391, 18195219, 23291268, 29497776, 36994902, 45983070, 56684355, 69343911, 84231441
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OFFSET
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1,1
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COMMENTS
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Column 6 of A207068
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = (7/120)*n^6 + (147/40)*n^5 + (49/3)*n^4 + (91/8)*n^3 - (707/120)*n^2 - (91/20)*n
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EXAMPLE
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Some solutions for n=4
..0..0..0..0..0..0....0..1..1..1..0..0....1..0..1..1..1..0....1..1..1..1..1..0
..1..0..1..1..1..0....1..0..1..1..1..0....0..1..1..1..1..0....0..0..0..0..0..0
..0..0..0..0..0..0....1..0..0..0..0..0....0..1..1..1..0..0....0..0..0..0..0..0
..0..0..0..0..0..0....1..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0
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CROSSREFS
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Sequence in context: A207517 A207246 A208167 * A207121 A207440 A188691
Adjacent sequences: A207063 A207064 A207065 * A207067 A207068 A207069
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Feb 14 2012
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STATUS
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approved
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