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Search: id:A107956
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| A107956 |
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(1/2880)(n+1)(n+2)^2*(n+3)^2*(n+4)(5n^2+21n+20). |
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+0
1
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| 1, 23, 205, 1120, 4508, 14700, 41076, 101970, 230505, 482911, 949949, 1772134, 3159520, 5416880, 8975184, 14430348, 22590297, 34531455, 51665845, 75820052, 109327372, 155134540, 216924500, 299256750, 407726865, 549146871, 731748213
(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->(1/2880)*(n+1)*(n+2)^2*(n+3)^2*(n+4)*(5*n^2+21*n+20): seq(a(n), n=0..30);
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CROSSREFS
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Sequence in context: A065316 A060882 A128334 this_sequence A022683 A042020 A084428
Adjacent sequences: A107953 A107954 A107955 this_sequence A107957 A107958 A107959
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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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