%I #9 Aug 16 2019 10:50:22
%S 0,0,0,0,3,6,34,148
%N Number of connected ungraceful graphs on n nodes.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/GracefulGraph.html">Graceful Graph</a>
%Y Cf. A308556 (not necessarily connected ungraceful graphs).
%K nonn,more
%O 1,5
%A _Eric W. Weisstein_, Jun 07 2019
%E a(8) from _Eric W. Weisstein_, Aug 16 2019