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%I #16 Jul 06 2020 02:51:25
%S 1,6,18,60,210,726,2448,8448,28818,98556,336618,1150320,3928944,
%T 13419204,45828192,156512220,534463698,1825120584,6232259412,
%U 21281168202,72666555570,248124503652,847224827676,2892836367066,9877456541376,33725891989626
%N Number of endless self-avoiding walks of length 2*n for the honeycomb lattice.
%H Nathan Clisby, <a href="https://arxiv.org/abs/1302.2796">Endless self-avoiding walks</a>, arXiv:1302.2796 [cond-mat.stat-mech], 2013. See Table 4 p. 23.
%Y A001668 counts all self-avoiding walks on the honeycomb lattice, without the "endless" restriction.
%Y Cf. A334322 (square lattice), A334326 (simple cubic lattice), A334331 (triangular lattice), A334332 (union jack lattice), A334333 (body centered cubic lattice), A334334 (face centered cubic lattice).
%K nonn,walk
%O 0,2
%A _Michel Marcus_, Apr 23 2020
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