[seqfan] Re: symmetric 0-1 matrices

Paul D Hanna pauldhanna at juno.com
Thu Feb 3 08:06:16 CET 2011

And I added the following formulae along with PARI code (not yet published):
G.f. of row n: (1+x^2)^(n(n-1)/2)*(1+x)^n for n>=1. 
G.f.: A(x,y) = Sum_{n>=1} x^n*(1+y)^n*Product_{k=1..n} (1-x(1+y)(1+y^2)^(2k-2))/(1-x(1+y)(1+y^2)^(2k-1) due to a q-series identity.
The g.f. of row n may be obvious from Brendan's formula, but the g.f. A(x,y) is a nice series representation that follows directly from it. 
---------- Original Message ----------
From: "N. J. A. Sloane" <njas at research.att.com>
To: seqfan at list.seqfan.eu
Subject: [seqfan] Re: symmetric 0-1 matrices
Date: Thu, 3 Feb 2011 01:14:28 -0500

I added that triangle to the OEIS - see A184948.


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