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A153337
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Number of zig-zag paths from top to bottom of a 2n-1 by 2n-1 square whose color is that of the top right corner
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4
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1, 4, 24, 136, 720, 3624, 17584, 83024, 383904, 1746280, 7839216, 34812144, 153204064, 669108496, 2903267040, 12526343584, 53779871552, 229895033832, 978965187184, 4154438114480, 17575883030496, 74150192517808
(list; graph; refs; listen; history; internal format)
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