The authors enumerated the number of self-avoiding polygons on the honeycomb lattice to 82 steps. Analysis of the resulting series gives for the connective constant mu =1.8477594+or-6*10 -6 , in agreement with Nienhuis' value (1984) of mu =(2+2) 1 2/=1.84775906. . .. The critical exponent alpha =0.4999+or-10 -4 (unbiased), or alpha =0.49998+or-2*10 $ 0- 5 (biased). A non-physical singularity on the negative real axis is accurately located, and some curious results concerning the confluent singularity are obtained.
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Enting et al. (1989) studied this question.
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