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A187856 Number of 8-step king-knight's tours (piece capable of both kinds of moves) on an n X n board summed over all starting positions 1
0, 0, 49536, 7067600, 71450504, 288493336, 741624088, 1474319716, 2497432760, 3806665836, 5395343360, 7259273932, 9396774760, 11807403172, 14491089616, 17447829164, 20677621816, 24180467572, 27956366432, 32005318396, 36327323464 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 8 of A187850

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..50

FORMULA

Empirical: a(n) = 136526552*n^2 - 1275583564*n + 2906368876 for n>13

EXAMPLE

Some solutions for 3X3

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

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

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

CROSSREFS

Sequence in context: A210351 A234563 A251881 * A258320 A258131 A081636

Adjacent sequences:  A187853 A187854 A187855 * A187857 A187858 A187859

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 14 2011

STATUS

approved

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Last modified October 25 01:40 EDT 2021. Contains 348233 sequences. (Running on oeis4.)