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Number of symmetric self-avoiding polygons on hexagonal lattice with perimeter n, not counting rotations and reflections as distinct.
5

%I #5 Jun 27 2018 18:43:39

%S 0,0,1,1,1,4,3,10,9,36,27,129,90,449,331

%N Number of symmetric self-avoiding polygons on hexagonal lattice with perimeter n, not counting rotations and reflections as distinct.

%H Hugo Pfoertner, <a href="http://www.randomwalk.de/sequences/a284869.htm">Illustration of polygons of perimeter <= 11</a>.

%Y Cf. A036418, A284869, A306176.

%K nonn,walk,more

%O 1,6

%A _Hugo Pfoertner_, Jun 27 2018