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%I #6 Feb 16 2025 08:34:06
%S 1,3,21,1473,123121657
%N Number of connected induced (non-null) subgraphs of the n-Pell graph.
%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PellGraph.html">Pell Graph</a>
%K nonn,more,changed
%O 0,2
%A _Eric W. Weisstein_, Sep 06 2023