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%I #7 May 08 2020 22:12:33
%S 1,2,8,64,809,13846,301262,8035168,255780779,9519891214,407613033836,
%T 19816627136912,1082142442901863,65776576008442274,
%U 4416031241930248774,325289604104049686096,26137255635911145802777,2279186202842678350137218,214713550195887533572753024
%N Number of n X n symmetric binary matrices with no row sum greater than 3.
%H Andrew Howroyd, <a href="/A139679/b139679.txt">Table of n, a(n) for n = 0..100</a>
%Y Column k=3 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