1,2

Table of n, a(n) for n=1..63.

Eric Weisstein's World of Mathematics, Haar Graph

Haar(5) and Haar(6) are both isomorphic to the 6-cycle graph, so 5 appears in the sequence but 6 does not.

Cf. A272919 (numbers that uniquely index a Haar graph).

Sequence in context: A107686 A004743 A114994 * A324766 A039224 A161508

Adjacent sequences: A137703 A137704 A137705 * A137707 A137708 A137709

nonn

Eric W. Weisstein, Feb 07 2008

Name clarified by Eric W. Weisstein, Aug 19 2017

approved