login
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
OFFSET
1,3
COMMENTS
Row 8 of A187286
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 08 2011
STATUS
approved