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%I #16 Dec 30 2023 13:30:46
%S 3,12,552,6978816,429714433137180672,
%T 868161947968780041877535786874146453722578812928
%N Numbers of (undirected) Hamiltonian paths in the n-Sierpiński gasket graph.
%C Explicit formula and asymptotic are given by Chang and Chen (2011).
%C a(7) contains 137 decimal digits.
%H S.-C. Chang, L.-C. Chen. Hamiltonian walks on the Sierpinski gasket, J. Math. Phys. 52 (2011), 023301. doi:<a href="http://dx.doi.org/10.1063/1.3545358">10.1063/1.3545358</a>. arXiv:<a href="http://arxiv.org/abs/0909.5541">0909.5541</a>.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/HamiltonianPath.html">Hamiltonian Path</a>.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/SierpinskiGasketGraph.html">Sierpiński Gasket Graph</a>.
%Y Cf. A234635, A246958, A246959.
%K nonn
%O 1,1
%A _Max Alekseyev_, Sep 08 2014