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Search: id:A114239
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| A114239 |
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a(n)=(n+1)(n+2)^3*(n+3)(n^2+4n+5)/120. |
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+0
2
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| 1, 18, 136, 650, 2331, 6860, 17472, 39852, 83325, 162382, 298584, 522886, 878423, 1423800, 2236928, 3419448, 5101785, 7448874, 10666600, 15008994, 20786227, 28373444, 38220480, 50862500, 66931605, 87169446, 112440888, 143748766
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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.
First differences of A107891. Partial sums of A083200. - Peter Bala (pbala(AT)toucansurf.com), Sep 21 2007
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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 (see p. 167, Table 10.5/I/6).
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MAPLE
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a:=n->(n+1)*(n+2)^3*(n+3)*(n^2+4*n+5)/120: seq(a(n), n=0..33);
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CROSSREFS
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Cf. A083200, A107891.
Sequence in context: A010824 A022710 A056003 this_sequence A087115 A108680 A081074
Adjacent sequences: A114236 A114237 A114238 this_sequence A114240 A114241 A114242
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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), Nov 18 2005
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