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Search: id:A107917
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| A107917 |
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(1/86400)(n+1)(n+2)^2*(n+3)^3*(n+4)^2*(n+5)(n^2+6n+10). |
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+0
2
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| 1, 34, 455, 3626, 20580, 91728, 340956, 1099890, 3166449, 8302294, 20131111, 45677996, 97894160, 199645824, 389817072, 732389580, 1329624009, 2340785370, 4008235231, 6693165094, 10923775940, 17459327600, 27374197500, 42166911150
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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->(1/86400)*(n+1)*(n+2)^2*(n+3)^3*(n+4)^2*(n+5)*(n^2+6*n+10): seq(a(n), n=0..27);
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CROSSREFS
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Sequence in context: A135243 A033914 A159655 this_sequence A066291 A020929 A160279
Adjacent sequences: A107914 A107915 A107916 this_sequence A107918 A107919 A107920
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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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