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

1,3

Comments

Row 7 of A187857

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

Example

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

Crossrefs

Sequence in context: A190031 A254694 A279983 * A186864 A338963 A135239

Adjacent sequences: A187859 A187860 A187861 * A187863 A187864 A187865

Keyword

nonn

Author

R. H. Hardin Mar 14 2011

Status

approved