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A187028 Number of 3-step one or two collinear space at a time queen's tours on an n X n board summed over all starting positions 0
0, 24, 296, 1008, 2232, 3936, 6120, 8784, 11928, 15552, 19656, 24240, 29304, 34848, 40872, 47376, 54360, 61824, 69768, 78192, 87096, 96480, 106344, 116688, 127512, 138816, 150600, 162864, 175608 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A187027

LINKS

Table of n, a(n) for n=1..29.

FORMULA

Empirical: a(n) = 240*n^2 - 936*n + 912 for n>3

EXAMPLE

Some solutions for 4X4

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

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

..0..0..1..0....0..1..0..0....0..0..0..0....0..0..0..0....0..0..3..0

..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0

CROSSREFS

Sequence in context: A282993 A295272 A086941 * A186966 A281134 A128598

Adjacent sequences:  A187025 A187026 A187027 * A187029 A187030 A187031

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 02 2011

STATUS

approved

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Last modified October 17 21:17 EDT 2021. Contains 348065 sequences. (Running on oeis4.)