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A030520
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Number of polyhexes of class PF2 with C_{2n} symmetry.
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9
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0, 1, 5, 20, 82, 335, 1402, 5949, 25652, 111963, 494157, 2201270, 9886034, 44712737, 203489627, 931191850, 4282171470, 19778577235, 91715812335, 426824400684, 1992828161414, 9332192498397, 43821128181652, 206288470970025, 973361629499032, 4602638827207605
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OFFSET
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2,3
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COMMENTS
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See reference for precise definition.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Title improved, a(2)=0 inserted, and more terms from Sean A. Irvine, Apr 02 2020
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STATUS
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approved
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