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A186867 Number of 8-step king's tours on an n X n board summed over all starting positions 0
0, 0, 2384, 183472, 1110000, 3193800, 6481216, 10899404, 16418600, 23038804, 30760016 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 8 of A186861

LINKS

Table of n, a(n) for n=1..11.

FORMULA

Empirical: a(n) = 550504*n^2 - 3839372*n + 6382124 for n>6

EXAMPLE

Some solutions for 4X4

..0..7..6..0....2..1..0..8....0..0..1..0....0..0..6..8....3..4..5..0

..8..0..5..1....4..3..7..0....0..0..3..2....0..0..7..5....2..0..6..0

..0..4..3..2....0..5..6..0....0..7..5..4....2..1..4..0....1..0..7..8

..0..0..0..0....0..0..0..0....0..8..6..0....0..3..0..0....0..0..0..0

CROSSREFS

Sequence in context: A251649 A218849 A254562 * A210078 A172653 A172677

Adjacent sequences:  A186864 A186865 A186866 * A186868 A186869 A186870

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 27 2011

STATUS

approved

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Last modified June 17 16:56 EDT 2019. Contains 324196 sequences. (Running on oeis4.)