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A078876
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n^4*(n^4-1)/240.
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0
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0, 1, 27, 272, 1625, 6993, 24010, 69888, 179334, 416625, 893101, 1791504, 3398759, 6148961, 10678500, 17895424, 29065308, 45916065, 70764303, 106666000, 157594437, 228648497, 326294606, 458645760, 635781250, 870110865, 1176787521
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Kekule numbers for certain benzenoids. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jun 12 2005
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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 (p. 230, #14).
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CROSSREFS
| Cf. A002415.
Sequence in context: A181323 A136926 A042412 * A059603 A049011 A115246
Adjacent sequences: A078873 A078874 A078875 * A078877 A078878 A078879
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KEYWORD
| nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 11 2003
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