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%I #16 Feb 11 2018 10:23:19
%S 4,8,14,28,50,100,180,360,650,1300,2350,4700,8500,17000,30750,61500,
%T 111250,222500,402500,805000,1456250,2912500,5268750,10537500,
%U 19062500,38125000,68968750,137937500,249531250,499062500,902812500,1805625000
%N Number of zig-zag paths from top to bottom of a rectangle of width 9 with n rows whose color is not that of the top right corner
%H Joseph Myers, <a href="http://www.polyomino.org.uk/publications/2008/bmo1-2009-q1.pdf">BMO 2008--2009 Round 1 Problem 1---Generalisation</a>
%F Empirical G.f.: x*(4+8*x-6*x^2-12*x^3)/(1-5*x^2+5*x^4). - _Colin Barker_, Jan 04 2012
%Y A153362, A153363, A153365, A153366, A153367
%K easy,nonn
%O 1,1
%A _Joseph Myers_, Dec 24 2008
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