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Number of connected ungraceful graphs on n nodes.
1

%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