A187031 Number of 6-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, 15760, 263000, 1251720, 3443028, 7080688, 12213336, 18821144, 26872340, 36353568

Offset

1,3

Comments

Row 6 of A187027

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Sequence in context: A350884 A190834 A183966 * A233642 A246042 A235755

Adjacent sequences: A187028 A187029 A187030 * A187032 A187033 A187034

Keyword

nonn

Author

R. H. Hardin Mar 02 2011

Status

approved