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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

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

CROSSREFS

Sequence in context: A188990 A189200 A042405 * A309422 A212705 A046199

Adjacent sequences: A187301 A187302 A187303 * A187305 A187306 A187307

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 08 2011

STATUS

approved

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Last modified March 30 13:03 EDT 2023. Contains 361618 sequences. (Running on oeis4.)