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Search: id:A107908
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| A107908 |
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(1/720)(n+1)(n+2)^2*(n+3)^2*(n+4)(3n+5). |
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+0
1
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| 1, 16, 110, 490, 1666, 4704, 11592, 25740, 52635, 100672, 182182, 314678, 522340, 837760, 1303968, 1976760, 2927349, 4245360, 6042190, 8454754, 11649638, 15827680, 21229000, 28138500, 36891855, 47882016, 61566246, 78473710
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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 (see p. 167).
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MAPLE
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a:=n->(1/720)*(n+1)*(n+2)^2*(n+3)^2*(n+4)*(3*n+5): seq(a(n), n=0..33);
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CROSSREFS
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Sequence in context: A083469 A056001 A053526 this_sequence A000143 A035016 A081194
Adjacent sequences: A107905 A107906 A107907 this_sequence A107909 A107910 A107911
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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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