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A060206
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Number of rotationally symmetric closed meanders of length 4n+2.
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10
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1, 2, 10, 66, 504, 4210, 37378, 346846, 3328188, 32786630, 329903058, 3377919260, 35095839848, 369192702554, 3925446804750, 42126805350798, 455792943581400, 4967158911871358, 54480174340453578, 600994488311709056, 6664356253639465480
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OFFSET
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0,2
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COMMENTS
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Closed meanders of other lengths do not have rotational symmetry. - Andrew Howroyd, Nov 24 2015
See A077460 for additional information on the symmetries of closed meanders.
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LINKS
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FORMULA
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MATHEMATICA
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A000682 = Import["https://oeis.org/A000682/b000682.txt", "Table"][[All, 2]];
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CROSSREFS
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KEYWORD
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nonn,nice
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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