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A278993
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Number of simple chord diagrams with n chords, up to rotation.
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3
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0, 1, 1, 4, 21, 176, 1893, 25030, 382272, 6604535, 127222636, 2702798537, 62778105236, 1582725739329, 43046433007765, 1256332883208474, 39165907107963273, 1298945495674093932, 45666536827274985585, 1696460750775267473762
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OFFSET
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1,4
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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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STATUS
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approved
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