A187048 - OEIS

A187048

Number of 4-step one or two space at a time bishop's tours on an n X n board summed over all starting positions

0, 0, 24, 272, 1084, 2660, 5032, 8164, 12056, 16708, 22120, 28292, 35224, 42916, 51368, 60580, 70552, 81284, 92776, 105028, 118040, 131812, 146344, 161636, 177688, 194500, 212072, 230404, 249496, 269348, 289960, 311332, 333464, 356356, 380008

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

COMMENTS

Row 4 of A187046

LINKS

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

FORMULA

Empirical: a(n) = 380*n^2 - 2568*n + 4388 for n>5

EXAMPLE

Some solutions for 4X4

..0..0..4..0....0..0..0..0....0..0..1..0....0..0..3..0....0..1..0..0

..0..0..0..3....4..0..1..0....0..3..0..0....0..2..0..0....0..0..3..0

..0..0..2..0....0..0..0..2....2..0..0..0....4..0..0..0....0..0..0..2

..0..0..0..1....0..0..3..0....0..0..0..4....0..0..0..1....4..0..0..0

CROSSREFS

Sequence in context: A022065 A125412 A270846 * A000915 A006665 A010940

Adjacent sequences: A187045 A187046 A187047 * A187049 A187050 A187051

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 02 2011

STATUS

approved