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%I #7 Jun 18 2017 20:22:32
%S 1,11,1033,1030304099,873851166316875626844153297,
%T 531723201747806346628696993678355296791302025810590916630277786972117723914960891
%N Numbers of undirected cycles in the n-Sierpinski sieve graph.
%C Term a(7) has 243 decimal digits and a(8) has 727 decimal digits. - _Andrew Howroyd_, Jun 18 2017
%H Andrew Howroyd, <a href="/A234634/b234634.txt">Table of n, a(n) for n = 1..8</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/GraphCycle.html">Graph Cycle</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/SierpinskiSieveGraph.html">Sierpinski Sieve Graph</a>
%Y Cf. A246957, A246958, A246959.
%K nonn
%O 1,2
%A _Eric W. Weisstein_, Dec 28 2013
%E a(4)-a(6) from _Andrew Howroyd_, Jun 18 2017
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