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A107943
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(1/8640)*(n+1)*(n+2)^2*(n+3)^2*(n+4)^2*(n+5)*(2*n+3).
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0
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1, 25, 245, 1470, 6468, 22932, 69300, 185130, 448305, 1002001, 2095093, 4140500, 7796880, 14080080, 24511824, 41314284, 67660425, 107991345, 168413245, 257188162, 385334180, 567352500, 822100500, 1173831750, 1653425865
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OFFSET
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0,2
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COMMENTS
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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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LINKS
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Table of n, a(n) for n=0..24.
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FORMULA
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G.f.: (1+15*x+40*x^2+25*x^3+3*x^4)/(1-x)^10 - Bruno Berselli, Apr 19 2011
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MAPLE
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a:=n->(1/8640)*(n+1)*(n+2)^2*(n+3)^2*(n+4)^2*(n+5)*(2*n+3): seq(a(n), n=0..30);
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MATHEMATICA
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Table[((n+1)(n+2)^2(n+3)^2(n+4)^2(n+5)(2n+3))/8640, {n, 0, 30}] (* From Harvey P. Dale, Apr 19 2011 *)
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CROSSREFS
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Sequence in context: A160222 A088890 A108178 * A125388 A126546 A023073
Adjacent sequences: A107940 A107941 A107942 * A107944 A107945 A107946
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KEYWORD
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nonn
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AUTHOR
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Emeric Deutsch, Jun 12 2005
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STATUS
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approved
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