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A110694
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Kekule numbers for certain benzenoids.
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0
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1, 19, 142, 664, 2330, 6726, 16848, 37884, 78243, 150865, 274846, 477412, 796276, 1282412, 2003280, 3046536, 4524261, 6577743, 9382846, 13156000, 18160846, 24715570, 33200960, 44069220, 57853575, 75178701, 96772014, 123475852
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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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 (see p 243, M_n(LLLAALL)).
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FORMULA
| a(n)=(n+1)(n+2)(n+3)(n+4)(34n^3+199n^2+355n+210)/5040.
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MAPLE
| a:=n->(n+1)*(n+2)*(n+3)*(n+4)*(34*n^3+199*n^2+355*n+210)/5040: seq(a(n), n=0..31);
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CROSSREFS
| Sequence in context: A104046 A060104 A201151 * A107962 A002615 A081590
Adjacent sequences: A110691 A110692 A110693 * A110695 A110696 A110697
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KEYWORD
| nonn
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AUTHOR
| Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 03 2005
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