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Search: id:A109122
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| A109122 |
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4(n+1)^2*(3n+1)^2*(12n^2+20n+5). |
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+0
1
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| 20, 9472, 164052, 1107200, 4681300, 14929920, 39411092, 90821632, 188932500, 362835200, 653499220, 1116640512, 1825901012, 2876339200, 4388231700, 6511185920, 9428563732, 13362216192, 18577529300, 25388780800, 34164808020
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OFFSET
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0,1
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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 (pp. 311).
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FORMULA
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G.f.=4(5+2333z+24542z^2+39262z^3+11293z^4+325z^5)/(1-z)^7.
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MAPLE
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a:=n->4*(n+1)^2*(3*n+1)^2*(12*n^2+20*n+5): seq(a(n), n=0..24);
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CROSSREFS
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Sequence in context: A123379 A135292 A013725 this_sequence A135420 A045811 A086687
Adjacent sequences: A109119 A109120 A109121 this_sequence A109123 A109124 A109125
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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 19 2005
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