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A186865 Number of 6-step king's tours on an n X n board summed over all starting positions 0
0, 0, 2240, 22672, 74072, 156484, 268048, 408764, 578632, 777652, 1005824, 1263148, 1549624, 1865252, 2210032, 2583964, 2987048, 3419284, 3880672, 4371212, 4890904, 5439748 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 6 of A186861

LINKS

Table of n, a(n) for n=1..22.

FORMULA

Empirical: a(n) = 14576*n^2 - 77924*n + 99292 for n>4

EXAMPLE

Some solutions for 3X3

..0..2..0....0..4..0....0..4..3....0..0..0....0..2..1....3..2..0....0..4..5

..1..3..4....2..3..5....6..5..2....1..2..6....0..4..3....4..0..1....3..0..6

..6..5..0....1..6..0....0..0..1....3..4..5....0..5..6....6..5..0....1..2..0

CROSSREFS

Sequence in context: A288846 A289454 A079013 * A038728 A002520 A183771

Adjacent sequences:  A186862 A186863 A186864 * A186866 A186867 A186868

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 27 2011

STATUS

approved

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Last modified May 26 19:44 EDT 2019. Contains 323597 sequences. (Running on oeis4.)