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A187863 Number of 8-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, 1008, 61668, 636102, 2432312, 6343874, 12918800, 22675997, 35694138, 52156394, 71825663, 94825088, 120967427, 150298947, 182782127, 218416967, 257203467, 299141627, 344231447, 392472927, 443866067, 498410867, 556107327 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 8 of A187857

LINKS

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

FORMULA

Empirical: a(n) = 1575830*n^2 - 16367550*n + 41250447 for n>13

EXAMPLE

Some solutions for 4X4

..0..7..0..0....0..7..0..0....0..0..0..3....5..0..0..0....0..0..5..0

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

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

..2..0..0..0....0..0..3..0....8..0..0..0....0..8..2..1....0..2..1..0

CROSSREFS

Sequence in context: A092924 A331770 A290286 * A280869 A145235 A210759

Adjacent sequences:  A187860 A187861 A187862 * A187864 A187865 A187866

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 14 2011

STATUS

approved

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Last modified January 21 10:25 EST 2022. Contains 350477 sequences. (Running on oeis4.)