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Search: id:A109121
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| A109121 |
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10(n+1)^3*(2n+1)(7n+5)^2. |
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+0
1
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| 250, 34560, 487350, 3028480, 12251250, 38016000, 98499310, 223948800, 461143530, 878560000, 1572243750, 2672386560, 4350609250, 6827950080, 10383558750, 15364096000, 22193838810, 31385491200, 43551700630
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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. 311).
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FORMULA
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G.f.=10(25+3281z+25068z^2+33404z^3+8539z^4+243z^5)/(1-z)^7.
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MAPLE
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a:=n->10*(n+1)^3*(2*n+1)*(7*n+5)^2: seq(a(n), n=0..28);
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CROSSREFS
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Adjacent sequences: A109118 A109119 A109120 this_sequence A109122 A109123 A109124
Sequence in context: A045169 A045185 A122270 this_sequence A033449 A142419 A142569
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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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