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Search: id:A108178
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| A108178 |
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(n+1)(n+2)^2*(n+3)^2*(n+4)(7n^2+23n+20)/2880. |
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+0
1
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| 1, 25, 235, 1330, 5488, 18228, 51660, 129690, 295845, 624481, 1236235, 2318680, 4153240, 7149520, 11888304, 19174572, 30101985, 46130385, 69177955, 101729782, 146964664, 208902100, 292571500, 404205750, 551461365, 743667561, 992106675
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OFFSET
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0,2
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COMMENT
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Kekule numbers for certain benzenoids.
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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 (p.230, no. 20).
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MAPLE
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a:=(n+1)*(n+2)^2*(n+3)^2*(n+4)*(7*n^2+23*n+20)/2880: seq(a(n), n=0..30);
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CROSSREFS
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Sequence in context: A053927 A081195 A088890 this_sequence A107943 A125388 A126546
Adjacent sequences: A108175 A108176 A108177 this_sequence A108179 A108180 A108181
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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), Jun 13 2005
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