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A153366 Number of zig-zag paths from top to bottom of a rectangle of width 9 with 2n-1 rows whose color is that of the top right corner. 5
5, 16, 56, 200, 720, 2600, 9400, 34000, 123000, 445000, 1610000, 5825000, 21075000, 76250000, 275875000, 998125000, 3611250000, 13065625000, 47271875000, 171031250000, 618796875000, 2238828125000, 8100156250000, 29306640625000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..24.

Joseph Myers, BMO 2008--2009 Round 1 Problem 1---Generalisation

FORMULA

Empirical G.f.: x*(5-9*x+x^2)/(1-5*x+5*x^2). - Colin Barker, Jan 04 2012

CROSSREFS

A153362, A153363, A153364, A153365, A153367

Sequence in context: A268225 A120343 A301280 * A057553 A226973 A006217

Adjacent sequences:  A153363 A153364 A153365 * A153367 A153368 A153369

KEYWORD

nonn,easy

AUTHOR

Joseph Myers, Dec 24 2008

STATUS

approved

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Last modified January 29 16:58 EST 2020. Contains 331347 sequences. (Running on oeis4.)