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Number of n X n symmetric binary matrices with no row sum greater than 4.
2

%I #8 May 08 2020 18:22:18

%S 1,2,8,64,1024,28217,1146419,62951431,4451407563,392447922178,

%T 42102440864054,5391561047209898,811314950514676762,

%U 141599096294933832181,28348376853054890615951,6448749608634353498219753,1653216120840296892595307251,474197636984335589673286631814

%N Number of n X n symmetric binary matrices with no row sum greater than 4.

%H Andrew Howroyd, <a href="/A139680/b139680.txt">Table of n, a(n) for n = 0..40</a>

%Y Column k=4 of A334548.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jun 13 2008

%E Terms a(13) and beyond from _Andrew Howroyd_, May 08 2020