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A237623
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Two-Special Pairs in a Free Group
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0
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0, 0, 0, 0, 0, 1, 2, 6, 14, 30, 62, 129, 252, 499, 984, 1884, 3624, 7025, 13358, 25694, 49316
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,7
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COMMENTS
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a(n) is the number of pairs of positive words of length n in a free group of rank 2 such that the words are not conjugate and they have the same SL(2,C) trace functions. This sequence was discovered by Julian Caballero, Ruben Espinoza, Carlos Salinas under the supervision of Sean D Lawton.
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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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