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Search: id:A108646
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| A108646 |
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(n+1)(n+2)^2*(n+3)(11n^3+58n^2+101n+60)/720. |
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+0
1
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| 1, 23, 194, 985, 3668, 11074, 28728, 66438, 140415, 276001, 511082, 900263, 1519882, 2473940, 3901024, 5982300, 8950653, 13101051, 18802210, 26509637, 36780128, 50287798, 67841720, 90405250, 119117115, 155314341, 200557098
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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.230, no. 22).
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MAPLE
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a:=(n+1)*(n+2)^2*(n+3)*(11*n^3+58*n^2+101*n+60)/720: seq(a(n), n=0..30);
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CROSSREFS
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Sequence in context: A160083 A140545 A062640 this_sequence A058193 A065314 A065316
Adjacent sequences: A108643 A108644 A108645 this_sequence A108647 A108648 A108649
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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 13 2005
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