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%I #11 Jan 04 2024 19:11:54
%S 0,0,0,2,16,108,847,11110,261072
%N Number of non-Wiener index-unique simple connected graphs on n nodes.
%C The paw graph and square graph C_4 on 4 have common Wiener index 8, while all other connected simple graphs on 4 nodes have unique Wiener indices, so a(4) = 2.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/WienerIndex.html">Wiener Index</a>
%K nonn,hard,more
%O 1,4
%A _Eric W. Weisstein_, Jul 18 2011
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