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Search: id:A107959
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| A107959 |
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(1/720)(n+1)(n+2)^2*(n+3)^2*(n+4)(n^2+5n+5). |
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+0
1
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| 1, 22, 190, 1015, 4018, 12936, 35784, 88110, 197835, 412126, 806806, 1498861, 2662660, 4550560, 7518624, 12058236, 18834453, 28731990, 42909790, 62865187, 90508726, 128250760, 179101000, 246782250, 335859615, 451886526, 601568982
(list; graph; listen)
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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. 229).
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MAPLE
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a:=n->(1/720)*(n+1)*(n+2)^2*(n+3)^2*(n+4)*(n^2+5*n+5): seq(a(n), n=0..30);
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CROSSREFS
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Adjacent sequences: A107956 A107957 A107958 this_sequence A107960 A107961 A107962
Sequence in context: A129126 A072040 A022682 this_sequence A110690 A020923 A031202
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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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