A187047 - OEIS

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, 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 * A201095 A239205 A050973

Adjacent sequences: A187044 A187045 A187046 * A187048 A187049 A187050

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 02 2011

STATUS

approved