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Search: id:A107969
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| A107969 |
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(1/720)(n+1)(n+2)^2*(n+3)(2n+3)(5n^2+19n+20). |
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+0
1
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| 1, 22, 182, 915, 3388, 10192, 26376, 60894, 128535, 252406, 467038, 822185, 1387386, 2257360, 3558304, 5455164, 8159949, 11941158, 17134390, 24154207, 33507320, 45807168, 61789960, 82332250, 108470115, 141420006, 182601342
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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).
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MAPLE
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a:=n->(1/720)*(n+1)*(n+2)^2*(n+3)*(2*n+3)*(5*n^2+19*n+20): seq(a(n), n=0..30);
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CROSSREFS
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Sequence in context: A041932 A125359 A126517 this_sequence A129126 A072040 A022682
Adjacent sequences: A107966 A107967 A107968 this_sequence A107970 A107971 A107972
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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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