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A223096
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Number of symmetric meander shapes with 2n+1 crossings.
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3
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1, 1, 2, 5, 13, 36, 102, 299, 889, 2698, 8267, 25684, 80349, 253872, 806334, 2580279, 8290645, 26794566, 86881179, 283034120, 924521718, 3031535538, 9962795554
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OFFSET
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0,3
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COMMENTS
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Number of symmetric foldings of 2n+1 stamps (A007822) in which end leaves are outwards. [Stéphane Legendre, Apr 09 2013]
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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