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A186854
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Number of 5-step knight's tours on a (n+2)X(n+2) board summed over all starting positions
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0
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16, 400, 2800, 9328, 21480, 39616, 63440, 92656, 127264, 167264, 212656, 263440, 319616, 381184, 448144, 520496, 598240, 681376, 769904, 863824, 963136, 1067840, 1177936, 1293424
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OFFSET
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1,1
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COMMENTS
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Row 5 of A186851
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LINKS
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Table of n, a(n) for n=1..24.
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FORMULA
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Empirical: a(n) = 2696*n^2 - 11224*n + 9904 for n>5
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EXAMPLE
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Some solutions for 5X5
..0..0..0..0..1....0..2..0..0..0....0..5..0..0..0....0..1..0..0..0
..0..3..0..0..0....0..0..0..3..0....0..0..0..2..0....3..0..0..0..0
..0..0..0..2..0....1..0..0..0..0....4..0..0..0..0....0..0..2..5..0
..0..0..4..0..0....0..0..4..0..0....0..0..3..0..1....0..4..0..0..0
..0..0..0..0..5....0..0..0..0..5....0..0..0..0..0....0..0..0..0..0
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CROSSREFS
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Sequence in context: A189849 A051360 A071133 * A035021 A202733 A172205
Adjacent sequences: A186851 A186852 A186853 * A186855 A186856 A186857
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Feb 27 2011
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STATUS
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approved
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