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A046721
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Number of semi-meanders of order n with 2 components.
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2
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1, 2, 6, 16, 48, 140, 428, 1308, 4072, 12796, 40432, 129432, 413900, 1342580, 4335288, 14201804, 46226896, 152594276, 500016036, 1660630740, 5472190206, 18264517264, 60475691308, 202684618564, 673892675030, 2266436498400, 7562707682032, 25510762766704, 85394319699916
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OFFSET
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2,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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