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A187293 Number of 8-step one or two space at a time rook's tours on an n X n board summed over all starting positions 1
0, 0, 2664, 134944, 866888, 2732016, 6049424, 10906120, 17282088, 25129488, 34417440, 45129696, 57260948, 70809512, 85775112, 102157696, 119957264, 139173816, 159807352, 181857872, 205325376, 230209864, 256511336, 284229792 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 8 of A187286

LINKS

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

FORMULA

Empirical: a(n) = 708492*n^2 - 5580668*n + 10074432 for n>13

EXAMPLE

Some solutions for 4X4

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

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

..0..4..3..0....0..0..0..2....0..0..8..2....0..3..4..5....4..0..0..8

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

CROSSREFS

Sequence in context: A224685 A167191 A002482 * A187195 A107532 A110838

Adjacent sequences:  A187290 A187291 A187292 * A187294 A187295 A187296

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 08 2011

STATUS

approved

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Last modified May 28 15:04 EDT 2022. Contains 354115 sequences. (Running on oeis4.)