[seqfan] Re: Counting multigraphs

franktaw at netscape.net franktaw at netscape.net
Tue Jun 21 00:47:20 CEST 2011

I don't understand A007717. I only count 5 multigraphs with 2 edges, 
not 7: 2 connected and 3 disconnected. The link in the sequence didn't 
get me to anything useful.

Franklin T. Adams-Watters

-----Original Message-----
From: Charles Greathouse <charles.greathouse at case.edu>

A sequence defined in terms of A007717 was recently submitted, and an
editor asked if it and A007717 could be extended.  A007717 itself is
marked as an easy sequence, but I must admit that I'm not sure how to
extend it.  If it is easy, would someone add a program and more terms
(ideally a 10,000-term b-file, but the standard three lines would do
as well)?  I assume this is one of the things that is "well-known to
those who well-know it".

On the other hand, if it's not easy the keyword, at least, should be
removed (and whatever can be added should be).

Charles Greathouse
Case Western Reserve University

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