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Search: id:A107962
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| A107962 |
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(1/720)(n+1)(n+2)^2*(n+3)(n+4)(5n^2+18n+15). |
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+0
2
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| 1, 19, 142, 665, 2338, 6762, 16968, 38214, 79035, 152581, 278278, 483847, 807716, 1301860, 2035104, 3096924, 4601781, 6694023, 9553390, 13401157, 18506950, 25196270, 33858760, 44957250, 59037615, 76739481, 98807814, 126105427
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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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FORMULA
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O.g.f.: (1+11*x+18*x^2+5*x^3)/(-1+x)^8. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 07 2008
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MAPLE
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a:=n->(1/720)*(n+1)*(n+2)^2*(n+3)*(n+4)*(5*n^2+18*n+15): seq(a(n), n=0..30);
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CROSSREFS
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Sequence in context: A104046 A060104 A110694 this_sequence A002615 A081590 A093646
Adjacent sequences: A107959 A107960 A107961 this_sequence A107963 A107964 A107965
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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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