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Search: id:A107943
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| A107943 |
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(1/8640)(n+1)(n+2)^2*(n+3)^2*(n+4)^2*(n+5)(2n+3). |
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+0
1
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| 1, 25, 245, 1470, 6468, 22932, 69300, 185130, 448305, 1002001, 2095093, 4140500, 7796880, 14080080, 24511824, 41314284, 67660425, 107991345, 168413245, 257188162, 385334180, 567352500, 822100500, 1173831750, 1653425865
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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. 229).
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MAPLE
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a:=n->(1/8640)*(n+1)*(n+2)^2*(n+3)^2*(n+4)^2*(n+5)*(2*n+3): seq(a(n), n=0..30);
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CROSSREFS
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Sequence in context: A081195 A088890 A108178 this_sequence A125388 A126546 A023073
Adjacent sequences: A107940 A107941 A107942 this_sequence A107944 A107945 A107946
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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 12 2005
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