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Search: id:A108648
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| A108648 |
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(n+1)^2*(n+2)^3*(n+3)/24. |
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+0
1
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| 1, 18, 120, 500, 1575, 4116, 9408, 19440, 37125, 66550, 113256, 184548, 289835, 441000, 652800, 943296, 1334313, 1851930, 2527000, 3395700, 4500111, 5888828, 7617600, 9750000, 12358125, 15523326, 19336968, 23901220, 29329875, 35749200
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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. 24).
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MAPLE
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a:=(n+1)^2*(n+2)^3*(n+3)/24: seq(a(n), n=0..36);
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CROSSREFS
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Sequence in context: A022678 A044350 A044731 this_sequence A037064 A107971 A002424
Adjacent sequences: A108645 A108646 A108647 this_sequence A108649 A108650 A108651
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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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