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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, 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
OFFSET
1,3
COMMENTS
Row 4 of A187046
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 02 2011
STATUS
approved