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%I #13 Apr 06 2020 12:32:25
%S 0,1,2,5,10,21,41,85,167,345,680,1421,2823,5953,11902,25341,50993,
%T 109409,221372,478189,972346,2112181,4313451,9415165,19301199,
%U 42303241,87015978,191398741,394888368,871297141,1802488991,3987998101,8270169571,18342194721
%N Number of polyhexes of class PF2 with a particular symmetry.
%C See reference for precise definition.
%C Cyvin has incorrect a(13)=273 and a(14)=608 in Table III due to using incorrect values for A026298(13) and A026298(14) in Table II. - _Sean A. Irvine_, Apr 03 2020
%H S. J. Cyvin, Zhang Fuji, B. N. Cyvin, Guo Xiaofeng, and J. Brunvoll, <a href="https://doi.org/10.1021/ci00009a021">Enumeration and classification of benzenoid systems. 32. Normal perifusenes with two internal vertices</a>, J. Chem. Inform. Comput. Sci., 32 (1992), 532-540.
%Y Cf. A026106, A026118, A026298, A030519, A030520, A030525, A030529, A030532, A030534.
%K nonn
%O 4,3
%A _N. J. A. Sloane_
%E a(13) and a(14) corrected and more terms from _Sean A. Irvine_, Apr 03 2020
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