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 A153363 Number of zig-zag paths from top to bottom of a rectangle of width 9 with n rows whose color is that of the top right corner 5
 5, 8, 16, 28, 56, 100, 200, 360, 720, 1300, 2600, 4700, 9400, 17000, 34000, 61500, 123000, 222500, 445000, 805000, 1610000, 2912500, 5825000, 10537500, 21075000, 38125000, 76250000, 137937500, 275875000, 499062500, 998125000, 1805625000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..32. Joseph Myers, BMO 2008--2009 Round 1 Problem 1---Generalisation FORMULA Empirical g.f.: x*(5+8*x-9*x^2-12*x^3+x^4)/(1-5*x^2+5*x^4). [Colin Barker, Sep 02 2012] CROSSREFS A153362, A153364, A153365, A153366, A153367 Sequence in context: A063924 A340997 A058566 * A154119 A196387 A258787 Adjacent sequences: A153360 A153361 A153362 * A153364 A153365 A153366 KEYWORD easy,nonn AUTHOR Joseph Myers, Dec 24 2008 STATUS approved

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Last modified December 7 01:11 EST 2023. Contains 367616 sequences. (Running on oeis4.)