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Search: id:A114241
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| A114241 |
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a(n)=(n+1)(n+2)(n+3)(11n^2+29n+20)/120. |
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+0
1
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| 1, 12, 61, 206, 546, 1232, 2478, 4572, 7887, 12892, 20163, 30394, 44408, 63168, 87788, 119544, 159885, 210444, 273049, 349734, 442750, 554576, 687930, 845780, 1031355, 1248156, 1499967, 1790866, 2125236, 2507776, 2943512, 3437808
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OFFSET
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0,2
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COMMENT
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Kekule numbers for certain benzenoids.
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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.168).
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MAPLE
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a:=n->(n+1)*(n+2)*(n+3)*(11*n^2+29*n+20)/120: seq(a(n), n=0..38);
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CROSSREFS
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Sequence in context: A076504 A044150 A044531 this_sequence A127766 A005173 A045822
Adjacent sequences: A114238 A114239 A114240 this_sequence A114242 A114243 A114244
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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 18 2005
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