[seqfan] Re: Counting multigraphs

franktaw at netscape.net franktaw at netscape.net
Tue Jun 21 01:09:18 CEST 2011

Sorry, I don't understand the representation scheme you are using here.

Franklin T. Adams-Watters

-----Original Message-----
From: Richard Guy <rkg at cpsc.ucalgary.ca>

Presumably 1111, 111, 121, 12, 11, 2 and 22.   R. 
On Mon, 20 Jun 2011, franktaw at netscape.net wrote: 
> 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 
> 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 
> Analyst/Programmer 
> Case Western Reserve University 
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