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Search: id:A108671
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| A108671 |
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(n+1)(n+2)^3*(n+3)(13n^2+37n+30)/720. |
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+0
1
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| 1, 24, 208, 1075, 4053, 12348, 32256, 75006, 159225, 314116, 583440, 1030393, 1743469, 2843400, 4491264, 6897852, 10334385, 15144672, 21758800, 30708447, 42643909, 58352932, 78781440, 105056250, 138509865, 180707436, 233475984
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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.231, # 29).
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MAPLE
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a:=n->(n+1)*(n+2)^3*(n+3)*(13*n^2+37*n+30)/720: seq(a(n), n=0..32);
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CROSSREFS
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Sequence in context: A132458 A055857 A047659 this_sequence A097321 A105946 A050222
Adjacent sequences: A108668 A108669 A108670 this_sequence A108672 A108673 A108674
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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), Jun 17 2005
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