A187304 - OEIS

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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

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