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A153338
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Number of zig-zag paths from top to bottom of a 2n-1 by 2n-1 square whose color is not that of the top right corner
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4
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0, 2, 18, 116, 650, 3372, 16660, 79592, 371034, 1697660, 7654460, 34106712, 150499908, 658707896, 2863150440, 12371226064, 53178791162, 227561427612, 969890051884, 4119092850680, 17438036501676, 73611934643368
(list; graph; refs; listen; history; internal format)
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