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%I #49 Sep 08 2017 05:25:22
%S 3,21,246,3765,64032,1130463,20215254,363069729,6530385420,
%T 117517503027,2115137375634
%N Wiener index of the n-Sierpinski sieve graph.
%C Apparently, there is a formula in the A. Hinz reference.
%H A. Hinz, A. Schief, <a href="https://doi.org/10.1007/BF01217750">The average distance on the Sierpinski gasket</a>, Probab. Th. Rel. Fields (1990) 87: 129.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/SierpinskiSieveGraph.html">Sierpiński Sieve Graph</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/WienerIndex.html">Wiener Index</a>
%Y Cf. A290004.
%K nonn,more
%O 1,1
%A _Andrew Howroyd_, Sep 03 2017
%E a(11) from _Eric W. Weisstein_, Sep 07 2017