A187028 Number of 3-step one or two collinear space at a time queen's tours on an n X n board summed over all starting positions.

0, 24, 296, 1008, 2232, 3936, 6120, 8784, 11928, 15552, 19656, 24240, 29304, 34848, 40872, 47376, 54360, 61824, 69768, 78192, 87096, 96480, 106344, 116688, 127512, 138816, 150600, 162864, 175608

Offset: 1

Author

R. H. Hardin Mar 02 2011

Keywords

• nonn

Comments

Row 3 of A187027

Examples

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

Formula

Empirical: a(n) = 240*n^2 - 936*n + 912 for n>3