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%I #7 Dec 04 2024 17:51:00
%S 4,12,28,70,168
%N Circumference of the n-Pell graph.
%C Likely a(n) = A000129(n+1) - 1 for n even and A000129(n+1) for n odd.
%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GraphCircumference.html">Graph Circumference</a>.
%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PellGraph.html">Pell Graph</a>.
%K nonn,more
%O 2,1
%A _Eric W. Weisstein_, Dec 04 2024