A187032 Number of 7-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, 36816, 1384152, 9151912, 30203792, 69641344, 129718288

Offset

1,3

Comments

Row 7 of A187027

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for 4X4
..3..0..2..0....0..0..6..0....0..3..4..0....0..7..0..0....0..0..0..0
..0..7..0..1....0..2..0..7....2..5..6..0....6..0..5..4....0..2..0..0
..4..6..5..0....0..1..5..0....1..7..0..0....2..1..0..0....0..1..6..0
..0..0..0..0....0..4..0..3....0..0..0..0....0..3..0..0....4..3..5..7

Crossrefs

Sequence in context: A061739 A232135 A212467 * A251386 A175748 A204104

Adjacent sequences: A187029 A187030 A187031 * A187033 A187034 A187035

Keyword

nonn

Author

R. H. Hardin Mar 02 2011

Status

approved