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A114240
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a(n)=(n+1)(n+2)^2*(n+3)(7n^2+23n+20)/240.
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0
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1, 15, 94, 380, 1176, 3038, 6888, 14148, 26895, 48037, 81510, 132496, 207662, 315420, 466208, 672792, 950589, 1318011, 1796830, 2412564, 3194884, 4178042, 5401320, 6909500, 8753355, 10990161, 13684230, 16907464, 20739930, 25270456
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Kekule numbers for certain benzenoids.
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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.168).
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MAPLE
| a:=n->(n+1)*(n+2)^2*(n+3)*(7*n^2+23*n+20)/240: seq(a(n), n=0..33);
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CROSSREFS
| Sequence in context: A108684 A125325 A126483 * A189657 A190274 A052459
Adjacent sequences: A114237 A114238 A114239 * A114241 A114242 A114243
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KEYWORD
| nonn
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AUTHOR
| Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 18 2005
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