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Number of n X n symmetric binary matrices with no row sum greater than 8.
2

%I #7 May 08 2020 22:13:19

%S 1,2,8,64,1024,32768,2097152,268435456,68719476736,34575388318705,

%T 32448313431713405,52469561348291720657,134755962211702695614887,

%U 514006997326078783646604259,2768435750908792178769980837441,20276667790903553518295082198527981

%N Number of n X n symmetric binary matrices with no row sum greater than 8.

%H Andrew Howroyd, <a href="/A139684/b139684.txt">Table of n, a(n) for n = 0..25</a>

%Y Column k=8 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