[seqfan] Re: Worry about old sequence, A030077, paths in K_n

[John Mason]

The logarithmic scatterplot looks unusual around a(15).
john

From: Neil Sloane
Sent: 02 April 2022 06:21
To: Sequence Fanatics Discussion list
Subject: [seqfan] Re: Worry about old sequence, A030077, paths in K_n

Maybe the dihedral group was mentioned because this sequence was a simpler
version of a sequence that asked for the *number* of different paths? I
agree it is irrelevant.

Best regards
Neil

Neil J. A. Sloane, Chairman, OEIS Foundation.
Also Visiting Scientist, Math. Dept., Rutgers University,
Email: njasloane at gmail.com



On Fri, Apr 1, 2022 at 11:59 PM Rob Pratt <robert.william.pratt at gmail.com>
wrote:

> I might be missing something, but it seems like the dihedral group
> business can just be omitted.  The number of distinct path *lengths* is the
> same with or without considering group operations.
>
> > On Apr 1, 2022, at 11:22 PM, Neil Sloane <njasloane at gmail.com> wrote:
> >
> > To Seq Fans, The creator of an interesting sequence,  A030077, Daniel
> > Gittelson, submitted 12 terms in 1999, and 4 more terms were added in
> 2007
> > by a former editor. Daniel G. wrote to me today, expressing doubt about
> the
> > 4 additional terms.
> >
> > He says he interrupted his study of sequences to pursue a medical career,
> > but now that he is retired, he can return to combinatorics.
> >
> > It would be nice if someone could verify the terms! (It is not at all
> > obvious to me how to do this.)
> >
> > Neil Sloane
> >
> > --
> > Seqfan Mailing list - http://list.seqfan.eu/
>
> --
> Seqfan Mailing list - http://list.seqfan.eu/
>

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