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A301796
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Number of 7 X n 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.
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1
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64, 610, 192, 221, 275, 364, 508, 741, 1118, 1728, 2715, 4312, 6896, 11077, 17842, 28788, 46499, 75156, 121524, 196549, 317942, 514360, 832171, 1346400, 2178440, 3524709, 5703018, 9227596, 14930483, 24157948, 39088300, 63246117, 102334286
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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) = 2*a(n-1) -a(n-3) for n>7.
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EXAMPLE
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Some solutions for n=5
..0..1..0..1..0. .0..1..1..0..0. .0..1..0..1..0. .0..0..1..1..0
..0..1..0..1..0. .0..0..1..1..0. .0..1..0..1..0. .1..0..0..1..1
..1..0..1..0..1. .1..0..0..1..0. .0..1..0..1..0. .1..1..0..0..1
..1..0..1..0..0. .1..1..0..1..0. .0..1..0..1..0. .0..1..1..0..0
..1..0..1..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..0..1..1..0
..1..0..0..1..0. .0..1..0..1..1. .0..1..0..1..1. .1..0..0..1..0
..1..1..0..1..0. .0..1..0..0..1. .0..1..0..0..1. .1..1..0..1..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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