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Search: id:A107963
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| A107963 |
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(1/360)(n+1)(n+2)(n+3)(n+4)(5n^2+19*n+15). |
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+0
5
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| 1, 13, 73, 273, 798, 1974, 4326, 8646, 16071, 28171, 47047, 75439, 116844, 175644, 257244, 368220, 516477, 711417, 964117, 1287517, 1696618, 2208690, 2843490, 3623490, 4574115, 5723991, 7105203, 8753563, 10708888, 13015288, 15721464
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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->(1/360)*(n+1)*(n+2)*(n+3)*(n+4)*(5*n^2+19*n+15): seq(a(n), n=0..36);
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CROSSREFS
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Contribution from Johannes W. Meijer (meijgia(AT)hotmail.com), Jun 18 2009: (Start)
Equals third right hand column of A161739 (RSEG2 triangle).
(End)
Sequence in context: A060886 A081586 A143008 this_sequence A006230 A066110 A020527
Adjacent sequences: A107960 A107961 A107962 this_sequence A107964 A107965 A107966
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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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