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Search: id:A110692
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| A110692 |
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Kekule numbers for certain benzenoids. |
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+0
1
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| 1, 29, 275, 1498, 5846, 18250, 48546, 114480, 245751, 489247, 915629, 1627418, 2768740, 4536884, 7195828, 11091888, 16671645, 24502305, 35294647, 49928714, 69482402, 95263102, 128842550, 172095040, 227239155, 296883171, 384074289
(list; graph; listen)
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OFFSET
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0,2
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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 (see p 243, M_n(LLAAAAL)).
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FORMULA
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a(n)=(n+1)(n+2)(n+3)(155n^4+911n^3+2062n^2+2122n+840)/5040.
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MAPLE
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a:=n->(n+1)*(n+2)*(n+3)*(155*n^4+911*n^3+2062*n^2+2122*n+840)/5040: seq(a(n), n=0..31);
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CROSSREFS
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Sequence in context: A142683 A042634 A120823 this_sequence A081684 A142033 A142905
Adjacent sequences: A110689 A110690 A110691 this_sequence A110693 A110694 A110695
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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), Aug 03 2005
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