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%I #15 Nov 05 2020 06:48:06
%S 1,16,5728,758857152
%N Number of graceful labelings of the n X n grid graph.
%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/GridGraph.html">Grid Graph</a>
%Y Cf. A336833.
%K nonn,more,bref
%O 1,2
%A _Eric W. Weisstein_, Sep 22 2020
%E a(4) from _Bert Dobbelaere_, Sep 28 2020
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