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

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