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%I #11 Apr 04 2020 04:47:35
%S 0,1,5,20,82,335,1402,5949,25652,111963,494157,2201270,9886034,
%T 44712737,203489627,931191850,4282171470,19778577235,91715812335,
%U 426824400684,1992828161414,9332192498397,43821128181652,206288470970025,973361629499032,4602638827207605
%N Number of polyhexes of class PF2 with C_{2n} symmetry.
%C See reference for precise definition.
%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 2,3
%A _N. J. A. Sloane_.
%E Title improved, a(2)=0 inserted, and more terms from _Sean A. Irvine_, Apr 02 2020
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