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A153365 Number of zig-zag paths from top to bottom of a rectangle of width 9 with 2n rows whose color is that of the top right corner. 5
8, 28, 100, 360, 1300, 4700, 17000, 61500, 222500, 805000, 2912500, 10537500, 38125000, 137937500, 499062500, 1805625000, 6532812500, 23635937500, 85515625000, 309398437500, 1119414062500, 4050078125000, 14653320312500 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..23.

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

FORMULA

Empirical G.f.: x*(8-12*x)/(1-5*x+5*x^2). - Colin Barker, Jan 04 2012

CROSSREFS

A153362, A153363, A153364, A153366, A153367

Sequence in context: A054114 A305907 A110687 * A317149 A316879 A220710

Adjacent sequences:  A153362 A153363 A153364 * A153366 A153367 A153368

KEYWORD

nonn,easy

AUTHOR

Joseph Myers, Dec 24 2008

STATUS

approved

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Last modified January 25 16:42 EST 2020. Contains 331245 sequences. (Running on oeis4.)