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A109116
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(n+1)^3*(n+2)^2*(n+5).
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1
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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; 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. 310).
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..10000
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FORMULA
| G.f.=4(5+73z+105z^2+z^3-4z^4)/(1-z)^7
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MAPLE
| a:=n->(n+1)^3*(n+2)^2*(n+5): seq(a(n), n=0..30);
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MATHEMATICA
| Table[(n+1)^3 (n+2)^2 (n+5), {n, 0, 30}] (* From Harvey P. Dale, Sep 24 2011 *)
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PROG
| (MAGMA) [(n+1)^3*(n+2)^2*(n+5): n in [0..30]]; // Vincenzo Librandi, Sep 25 2011
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CROSSREFS
| Sequence in context: A158601 A130832 A180810 * A136257 A190922 A099278
Adjacent sequences: A109113 A109114 A109115 * A109117 A109118 A109119
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KEYWORD
| nonn,easy
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AUTHOR
| Emeric Deutsch (deutsch(AT)duke.poly.edu), Jun 19 2005
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