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A187158
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Number of 5-step one space at a time bishop's tours on an n X n board summed over all starting positions.
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1
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0, 0, 0, 72, 388, 904, 1620, 2536, 3652, 4968, 6484, 8200, 10116, 12232, 14548, 17064, 19780, 22696, 25812, 29128, 32644, 36360, 40276, 44392, 48708, 53224, 57940, 62856, 67972, 73288, 78804, 84520, 90436, 96552, 102868, 109384, 116100, 123016, 130132
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OFFSET
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1,4
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 100*n^2 - 584*n + 808 for n>3.
G.f.: 4*x^4*(18 + 43*x - 11*x^2) / (1 - x)^3.
a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n>6.
(End)
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EXAMPLE
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Some solutions for 4 X 4:
..0..0..1..0....0..4..0..0....0..0..0..0....0..5..0..1....0..2..0..0
..0..2..0..0....3..0..5..0....0..3..0..5....4..0..2..0....3..0..1..0
..5..0..3..0....0..2..0..0....2..0..4..0....0..3..0..0....0..4..0..0
..0..4..0..0....0..0..1..0....0..1..0..0....0..0..0..0....0..0..5..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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