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A187862 Number of 7-step one space for components leftwards or up, two space for components rightwards or down asymmetric quasi-queen's tours (antidiagonal moves become knight moves) on an n X n board summed over all starting positions 1
0, 0, 1206, 26584, 180750, 568870, 1314428, 2456614, 4062007, 6094090, 8589253, 11504726, 14853686, 18625870, 22821278, 27439910, 32481766, 37946846, 43835150, 50146678, 56881430, 64039406, 71620606, 79625030, 88052678, 96903550 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
Row 7 of A187857
LINKS
FORMULA
Empirical: a(n) = 211612*n^2 - 1941340*n + 4328678 for n>11
EXAMPLE
Some solutions for 4X4
..0..3..5..4....0..0..4..0....0..0..0..0....0..3..2..0....0..1..0..0
..1..7..2..0....7..6..0..3....0..4..0..7....1..0..0..6....4..0..7..0
..0..0..6..0....0..5..0..2....0..3..2..6....0..4..0..5....3..2..6..0
..0..0..0..0....0..1..0..0....0..5..0..1....0..0..7..0....0..0..5..0
CROSSREFS
Sequence in context: A190031 A254694 A279983 * A186864 A338963 A135239
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 14 2011
STATUS
approved

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Last modified June 23 01:40 EDT 2024. Contains 373629 sequences. (Running on oeis4.)