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A187047
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Number of 3-step one or two space at a time bishop's tours on an n X n board summed over all starting positions
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0
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0, 0, 28, 136, 360, 696, 1144, 1704, 2376, 3160, 4056, 5064, 6184, 7416, 8760, 10216, 11784, 13464, 15256, 17160, 19176, 21304, 23544, 25896, 28360, 30936, 33624, 36424, 39336, 42360, 45496, 48744, 52104, 55576, 59160
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OFFSET
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1,3
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 56*n^2 - 280*n + 360 for n>3
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EXAMPLE
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Some solutions for 4X4
..0..0..0..0....0..0..1..0....3..0..1..0....0..0..0..0....0..3..0..0..
..0..0..1..0....0..0..0..0....0..2..0..0....0..0..1..0....0..0..0..0..
..0..2..0..0....2..0..0..0....0..0..0..0....0..3..0..0....0..0..0..2..
..3..0..0..0....0..3..0..0....0..0..0..0....2..0..0..0....0..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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