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A187047 Number of 3-step one or two space at a time bishop's tours on an n X n board summed over all starting positions 0
0, 0, 28, 136, 360, 696, 1144, 1704, 2376, 3160, 4056, 5064, 6184, 7416, 8760, 10216, 11784, 13464, 15256, 17160, 19176, 21304, 23544, 25896, 28360, 30936, 33624, 36424, 39336, 42360, 45496, 48744, 52104, 55576, 59160 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 3 of A187046

LINKS

Table of n, a(n) for n=1..35.

FORMULA

Empirical: a(n) = 56*n^2 - 280*n + 360 for n>3

EXAMPLE

Some solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A124956 A014705 A126415 * A074233 A201095 A239205

Adjacent sequences:  A187044 A187045 A187046 * A187048 A187049 A187050

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 02 2011

STATUS

approved

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Last modified November 27 10:45 EST 2021. Contains 349366 sequences. (Running on oeis4.)