[seqfan] Re: Definition of A141534

[Richard Mathar]

I think this basically solves the problem. I've submitted 
an associated update, https://oeis.org/draft/A141534 . The
first two rows of the underlying array are not aligned
with the rest, ie, they are not polygonal.

Richard


http://list.seqfan.eu/pipermail/seqfan/2011-June/014947.html :

References: <201106051042.p55AgdX3006281 at dommel.strw.leidenuniv.nl>
X-AOL-IP: 71.239.98.92
In-Reply-To: <201106051042.p55AgdX3006281 at dommel.strw.leidenuniv.nl>
From: franktaw at netscape.net
Message-Id: <8CDF1AD02D478EC-6D0-1B476 at webmail-d008.sysops.aol.com>
X-AOL-SENDER: franktaw at netscape.net
Subject: [seqfan] Re: Definition of A141534
X-BeenThere: seqfan at list.seqfan.eu
Precedence: list
List-Id: Sequence Fanatics Discussion list <seqfan.list.seqfan.eu>
List-Unsubscribe: <http://list.seqfan.eu/cgi-bin/mailman/options/seqfan>,
	<mailto:seqfan-request at list.seqfan.eu?subject=unsubscribe>
List-Archive: <http://list.seqfan.eu/pipermail/seqfan>
List-Post: <mailto:seqfan at list.seqfan.eu>
List-Help: <mailto:seqfan-request at list.seqfan.eu?subject=help>
List-Subscribe: <http://list.seqfan.eu/cgi-bin/mailman/listinfo/seqfan>,
	<mailto:seqfan-request at list.seqfan.eu?subject=subscribe>

ftaw> I don't think the sequence is in error, though I would like to see a 
ftaw> better definition.
ftaw> 
ftaw> The word "centered" is perhaps the key. The pentagonal numbers in the 
ftaw> sum appear to be the centered pentagonal numbers 
ftaw> http://oeis.org/A005891. Exactly how this continues for later values 
ftaw> (i.e., what kind of hexagonal values, etc., are being used) is not 
ftaw> clear to me.