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Search: id:A109117
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| 1, 144, 1485, 7168, 23625, 61776, 138229, 276480, 508113, 874000, 1425501, 2225664, 3350425, 4889808, 6949125, 9650176, 13132449, 17554320, 23094253, 29952000, 38349801, 48533584, 60774165, 75368448, 92640625, 112943376
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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 (pp. 310).
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FORMULA
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G.f.=(1+138z+636z^2+398z^3+27z^4)/(1-z)^6.
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MAPLE
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a:=n->(n+1)^3*(2*n+1)*(5*n+1): seq(a(n), n=0..30);
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CROSSREFS
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Adjacent sequences: A109114 A109115 A109116 this_sequence A109118 A109119 A109120
Sequence in context: A133062 A023096 A137416 this_sequence A066445 A008431 A121344
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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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