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A209030
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Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero and first differences in -6..6.
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1
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1, 4, 10, 60, 358, 2798, 22249, 186765, 1596162, 13907330, 122758794, 1096122478, 9880366438, 89796245827, 821927851286, 7570508171686, 70115797179348, 652594351781036, 6100765243003922, 57259681174637899, 539353919732122101, 5097036850039818860
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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EXAMPLE
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Some solutions for n=6:
-3 -6 -4 -4 -2 -3 -3 -3 -4 -6 -3 -3 -2 -4 -5 -5
-1 -1 -3 -3 0 -2 1 0 1 -4 -2 -1 -1 -3 1 -5
4 -1 0 2 1 2 3 -2 -3 2 2 4 2 2 -4 0
-2 3 5 3 -1 -1 -1 1 0 3 2 -1 0 3 2 5
0 5 4 4 0 1 -2 2 5 5 2 -1 0 0 5 4
2 0 -2 -2 2 3 2 2 1 0 -1 2 1 2 1 1
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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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