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Search: id:A109116
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| 20, 432, 3024, 12800, 40500, 105840, 241472, 497664, 947700, 1694000, 2874960, 4672512, 7320404, 11113200, 16416000, 23674880, 33428052, 46317744, 63102800, 84672000, 112058100, 146452592, 189221184, 241920000, 306312500, 384387120
(list; graph; listen)
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OFFSET
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0,1
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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 (pp. 310).
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FORMULA
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G.f.=4(5+73z+105z^2+z^3-4z^4)/(1-z)^7
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MAPLE
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a:=n->(n+1)^3*(n+2)^2*(n+5): seq(a(n), n=0..30);
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CROSSREFS
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Adjacent sequences: A109113 A109114 A109115 this_sequence A109117 A109118 A109119
Sequence in context: A041762 A068772 A130832 this_sequence A136257 A099278 A111158
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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 19 2005
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