%I #8 Mar 09 2020 20:54:42
%S 1,76,6912,848932,133948836,26615510712,6549149852112,
%T 1966499966796816,711040444591249476,305907023641901084832,
%U 154921887640109512226304,91469751377953081098144816,62419855497729620428436222688,48849705066296300911892229634944
%N Number of n X n symmetric binary matrices with all row sums 5.
%H Andrew Howroyd, <a href="/A139671/b139671.txt">Table of n, a(n) for n = 5..25</a>
%Y Column k=5 of A333157 and row 5 of A188448.
%K nonn
%O 5,2
%A _R. H. Hardin_, Jun 12 2008
%E Terms a(13) and beyond from _Andrew Howroyd_, Mar 09 2020