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 A153372 Number of zig-zag paths from top to bottom of a rectangle of width 11 with 2n-1 rows whose color is that of the top right corner. 5
 6, 20, 72, 264, 976, 3624, 13488, 50264, 187440, 699240, 2609008, 9735768, 36332016, 135588200, 506012592, 1888445784, 7047737776, 26302439784, 98161890288, 366344859224, 1367217022320, 5102522181480, 19042869606448 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Joseph Myers, BMO 2008--2009 Round 1 Problem 1---Generalisation FORMULA Empirical g.f. -2*x*(3-8*x+3*x^2) / ( (2*x-1)*(x^2-4*x+1) ) with a(n)= +6*a(n-1) -9*a(n-2) +2*a(n-3) and a(n) = (2^n+8*A001075(n))/3. - R. J. Mathar, Jun 16 2011 CROSSREFS Sequence in context: A146891 A235367 A189604 * A028402 A092760 A240043 Adjacent sequences:  A153369 A153370 A153371 * A153373 A153374 A153375 KEYWORD easy,nonn AUTHOR Joseph Myers, Dec 24 2008 STATUS approved

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Last modified August 8 18:40 EDT 2022. Contains 356016 sequences. (Running on oeis4.)