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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
1
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
1,3
COMMENTS
Row 9 of A187296
LINKS
FORMULA
Empirical: a(n) = 35254*n^2 - 316744*n + 644876 for n>15
CROSSREFS
Sequence in context: A188990 A189200 A042405 * A309422 A212705 A046199
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 08 2011
STATUS
approved