A187304 Number of 9-step one space leftwards or up, two space rightwards or down asymmetric rook's tours on an n X n board summed over all starting positions.

0, 0, 54, 2968, 25716, 87432, 209700, 399524, 668522, 1010572, 1430378, 1921532, 2485628, 3120300, 3825896, 4601996, 5448634, 6365780, 7353434, 8411596, 9540266, 10739444, 12009130, 13349324, 14760026, 16241236, 17792954, 19415180, 21107914

Offset: 1

Author

R. H. Hardin Mar 08 2011

Keywords

• nonn

Comments

Row 9 of A187296

Links

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

Formula

Empirical: a(n) = 35254*n^2 - 316744*n + 644876 for n>15