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%I #9 Feb 23 2014 04:46:10
%S 0,0,0,0,0,1,2,6,14,30,62,129,252,499,984,1884,3624,7025,13358,25694,
%T 49316
%N Two-Special Pairs in a Free Group
%C 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_.
%Y Cf. A059076.
%K nonn,more
%O 1,7
%A _Sean D Lawton_, Feb 10 2014
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