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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

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

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

Adjacent sequences:  A187859 A187860 A187861 * A187863 A187864 A187865

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 14 2011

STATUS

approved

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Last modified January 26 07:26 EST 2022. Contains 350573 sequences. (Running on oeis4.)