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A119708
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Number of free hexagonal polygons of symmetry class D_(3h) and area n.
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0
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0, 0, 1, 1, 0, 1, 1, 0, 1, 4, 0, 3, 4, 0, 3, 12, 0, 6, 19, 0, 10, 41, 0, 16, 72, 0, 28, 149, 0, 50, 72, 0, 87, 557, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,10
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REFERENCES
| Markus Voege, Anthony J. Guttmann and Iwan Jensen, "On the number of benzenoid hydrocarbons", J. Chem. Inf. Comput. Sci., (2002), vol. 42, 456-466.
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CROSSREFS
| Cf. A121212, A121211, A121210, A120991.
Sequence in context: A096303 A021252 A195775 * A106142 A092512 A060568
Adjacent sequences: A119705 A119706 A119707 * A119709 A119710 A119711
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Aug 27 2006
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