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Search: id:A109119
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| 2, 2662, 59582, 453962, 2060602, 6885902, 18787862, 44376082, 94091762, 183467702, 334568302, 577609562, 952759082, 1512116062, 2321871302, 3464647202, 5042017762, 7177208582, 10017976862, 13739671402, 18548472602
(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.=2(1+1324z+20495z^2+46360z^3+20495z^4+1324z^5+z^6)/(1-z)^7.
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MAPLE
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a:=n->2*(5*n^2+5*n+1)^3: seq(a(n), n=0..28);
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CROSSREFS
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Sequence in context: A133074 A135234 A114067 this_sequence A002495 A078457 A128148
Adjacent sequences: A109116 A109117 A109118 this_sequence A109120 A109121 A109122
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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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