[seqfan] Re: Sequence A139400

Richard Mathar mathar at strw.leidenuniv.nl
Tue Feb 3 16:50:04 CET 2009

rkg> From seqfan-bounces at list.seqfan.eu Tue Feb  3 01:57:17 2009
rkg> Date: Mon, 2 Feb 2009 17:30:15 -0700 (MST)
rkg> From: Richard Guy <rkg at cpsc.ucalgary.ca>
rkg> To: Sequence Fans <seqfan at seqfan.eu>
rkg> Subject: [seqfan]  Sequence A139400
rkg> In the formula for A139400 it seems
rkg> that the coefficient of a(n-22)
rkg> should be equal to that of a(n-10)
rkg> and not equal to those of a(n-21)
rkg> and a(n-11).  Also the signs seem
rkg> to be wrong.  Also it's misleading
rkg> to call 780 the seventh term of
rkg> A001353.  It is the sixth (involving
rkg> P_6); the zeroth is 0 and the first
rkg> is 1.
rkg> ...

These can be compared one-to-one with the G_6(n) entry on page 8 of
arXiv:0809.2551 :

%I A139400
%H A139400 Paul Raff, <a href="http://arxiv.org/abs/0809.2551">Spanning Trees in Grid Graphs</a>, arXiv:0809.2551 [math.CO]

More information about the SeqFan mailing list