A187862 Number of 7-step one space for components leftwards or up, two space for components rightwards or down asymmetric quasi-queen's tours (antidiagonal moves become knight moves) on an n X n board summed over all starting positions.

0, 0, 1206, 26584, 180750, 568870, 1314428, 2456614, 4062007, 6094090, 8589253, 11504726, 14853686, 18625870, 22821278, 27439910, 32481766, 37946846, 43835150, 50146678, 56881430, 64039406, 71620606, 79625030, 88052678, 96903550

Offset: 1

Author

R. H. Hardin Mar 14 2011

Keywords

• nonn

Comments

Row 7 of A187857

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..50

Formula

Empirical: a(n) = 211612*n^2 - 1941340*n + 4328678 for n>11