cp's OEIS Frontend

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.

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A237623 Two-Special Pairs in a Free Group.

Original entry on oeis.org

0, 0, 0, 0, 0, 1, 2, 6, 14, 30, 62, 129, 252, 499, 984, 1884, 3624, 7025, 13358, 25694, 49316
Offset: 1

Views

Author

Sean D Lawton, Feb 10 2014

Keywords

Comments

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.

Crossrefs

Cf. A059076.
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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