This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A237623 #11 Jul 23 2025 10:19:27 %S A237623 0,0,0,0,0,1,2,6,14,30,62,129,252,499,984,1884,3624,7025,13358,25694, %T A237623 49316 %N A237623 Two-Special Pairs in a Free Group. %C A237623 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 A237623 Cf. A059076. %K A237623 nonn,more %O A237623 1,7 %A A237623 _Sean D Lawton_, Feb 10 2014