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 A187380 Number of 6-step S, NW and NE-moving king's tours on a nXn board summed over all starting positions 1
 0, 0, 24, 264, 832, 1810, 3154, 4864, 6940, 9382, 12190, 15364, 18904, 22810, 27082, 31720, 36724, 42094, 47830, 53932, 60400, 67234, 74434, 82000, 89932, 98230, 106894, 115924, 125320, 135082, 145210, 155704, 166564, 177790, 189382, 201340 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Row 6 of A187377 LINKS R. H. Hardin, Table of n, a(n) for n = 1..50 FORMULA Empirical: a(n) = 183*n^2 - 1035*n + 1432 for n>4 EXAMPLE Some solutions for 4X4 ..0..6..4..0....4..0..0..0....0..1..0..0....0..5..0..0....0..1..0..0 ..1..3..5..0....5..3..0..0....0..2..0..0....4..6..0..0....0..2..0..6 ..2..0..0..0....6..0..2..0....0..3..5..0....1..3..0..0....0..3..5..0 ..0..0..0..0....0..0..0..1....0..4..6..0....2..0..0..0....0..4..0..0 CROSSREFS Sequence in context: A051828 A076847 A009175 * A000145 A126904 A001413 Adjacent sequences:  A187377 A187378 A187379 * A187381 A187382 A187383 KEYWORD nonn AUTHOR R. H. Hardin Mar 09 2011 STATUS approved

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Last modified May 18 21:01 EDT 2013. Contains 225428 sequences.