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Search: id:A108676
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| A108676 |
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(n+1)^2*(n+2)(5n^2+15n+12)/24. |
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+0
1
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| 1, 16, 93, 340, 950, 2226, 4606, 8688, 15255, 25300, 40051, 60996, 89908, 128870, 180300, 246976, 332061, 439128, 572185, 735700, 934626, 1174426, 1461098, 1801200, 2201875, 2670876, 3216591, 3848068, 4575040, 5407950, 6357976
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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.231, # 37).
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FORMULA
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G.f.=(1+10z+12z^2+2z^3)/(1-z)^6
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MAPLE
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a:=n->(n+1)^2*(n+2)*(5*n^2+15*n+12)/24: seq(a(n), n=0..36);
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CROSSREFS
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Adjacent sequences: A108673 A108674 A108675 this_sequence A108677 A108678 A108679
Sequence in context: A050406 A047674 A027938 this_sequence A066487 A128702 A143060
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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 17 2005
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