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A130914
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The number of Kekule structures of the rhombus-shaped benzenoid hydrocarbons.
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0
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OFFSET
| 1,1
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COMMENTS
| Here n is the number of aromatic sextets.
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REFERENCES
| I. Gutman, N. Turkovic and B. Furtula, "On distribution of pi electrons in rhombus-shaped benzenoid hydrocarbons", Indian Journal of Chemistry, Vol. 45A (2006), pp. 1601-1604. See Table 1 on page 1602.
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EXAMPLE
| If n=1 then the number of Kekule structures of the rhombus-shaped benzenoid hydrocarbons is 2.
If n=2 then the number of Kekule structures of the rhombus-shaped benzenoid hydrocarbons is 6.
If n=3 then the number of Kekule structures of the rhombus-shaped benzenoid hydrocarbons is 20.
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CROSSREFS
| Sequence in context: A147748 A150125 A065345 * A087944 A056616 A065346
Adjacent sequences: A130911 A130912 A130913 * A130915 A130916 A130917
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KEYWORD
| nonn
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Aug 23 2007
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