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Search: id:A110691
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| A110691 |
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Kekule numbers for certain benzenoids. |
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+0
1
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| 1, 45, 632, 4825, 25227, 101822, 340416, 986094, 2551725, 6028099, 13209768, 27179087, 53000311, 98685900, 176508416, 304743564, 509943033, 829849833, 1317083800, 2043740853, 3107066435, 4636381354, 6801456960, 9822556250
(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, H*(4,4,n)).
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FORMULA
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a(n)=(n+1)(n+2)^3*(n+3)(13n^4+104n^3+311n^2+412n+210)/5040.
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MAPLE
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a:=n->(n+1)*(n+2)^3*(n+3)*(13*n^4+104*n^3+311*n^2+412*n+210)/5040: seq(a(n), n=0..25);
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CROSSREFS
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Adjacent sequences: A110688 A110689 A110690 this_sequence A110692 A110693 A110694
Sequence in context: A147842 A027783 A090024 this_sequence A105251 A099632 A024379
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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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