%I #11 Jul 30 2020 11:41:57

%S 1,2,16,144,1428,25328,631026,25087224

%N Total number of graceful labelings of all simple graphs on n nodes.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/GracefulLabeling.html">Graceful Labeling</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/SimpleGraph.html">Simple Graph</a>

%K nonn,more,hard

%O 1,2

%A _Eric W. Weisstein_, Apr 03 2020

%E a(8) from _Eric W. Weisstein_, Jul 30 2020