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A186866 Number of 7-step king's tours on an n X n board summed over all starting positions 0
0, 0, 2984, 68272, 296360, 722384, 1335984, 2129440, 3102752, 4255920, 5588944, 7101824, 8794560, 10667152 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 7 of A186861

LINKS

Table of n, a(n) for n=1..14.

FORMULA

Empirical: a(n) = 89928*n^2 - 555464*n + 817760 for n>5

EXAMPLE

Some solutions for 3X3

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

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

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

CROSSREFS

Sequence in context: A235744 A235503 A120373 * A252571 A231628 A231623

Adjacent sequences:  A186863 A186864 A186865 * A186867 A186868 A186869

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 27 2011

STATUS

approved

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Last modified June 16 07:14 EDT 2019. Contains 324145 sequences. (Running on oeis4.)