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Search: id:A114479
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| A114479 |
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Kekule numbers for certain benzenoids. |
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+0
1
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| 3, 20, 136, 928, 6336, 43264, 295424, 2017280, 13774848, 94060544, 642285568, 4385800192, 29948116992, 204498534400, 1396403339264, 9535238438912, 65110680797184, 444603538866176, 3035942864551936, 20730714605486080
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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S. J. Cyvin and I. Gutman, Kekule structures in benzenoid hydrocarbons, Lecture Notes in Chemistry, No. 46, Springer, New York, 1988 (p. 205).
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FORMULA
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a(n)=[(4+sqrt(8))^(n+1)+(4-sqrt(8))^(n+1)]/16.
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MAPLE
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a:=((4+sqrt(8))^(n+1)+(4-sqrt(8))^(n+1))/16: seq(expand(a(n)), n=1..23);
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CROSSREFS
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Sequence in context: A000276 A056306 A056298 this_sequence A074574 A073514 A082143
Adjacent sequences: A114476 A114477 A114478 this_sequence A114480 A114481 A114482
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KEYWORD
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nonn
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AUTHOR
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Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 30 2005
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