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A109120
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10(n+1)^3*(n+2)(5n+7)^2.
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0
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980, 34560, 312120, 1548800, 5467500, 15482880, 37565360, 81285120, 161036100, 297440000, 518930280, 863516160, 1380726620, 2133734400, 3201660000, 4682055680, 6693569460, 9378789120, 12907266200, 17478720000, 23326421580
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Kekule numbers for certain benzenoids.
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REFERENCES
| 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
| G.f.=20(49+1385z+4539z^2+2771z^3+256z^4)/(1-z)^7.
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MAPLE
| a:=n->10*(n+1)^3*(n+2)*(5*n+7)^2: seq(a(n), n=0..28);
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CROSSREFS
| Sequence in context: A091080 A157515 A188337 * A128483 A056937 A122472
Adjacent sequences: A109117 A109118 A109119 * A109121 A109122 A109123
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KEYWORD
| nonn
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AUTHOR
| Emeric Deutsch (deutsch(AT)duke.poly.edu), Jun 19 2005
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