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Search: id:A123347
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| A123347 |
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Benzenoids (see the Cyvin-Gutman book for details). |
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+0
2
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| 1, 5, 22, 98, 436, 1940, 8632, 38408, 170896, 760400, 3383392
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Appears to be inverse binomial transform of A154234. If true, then a(n) = ((2+sqrt(6))^(n+1)+(2-sqrt(6))^(n+1))/4, also a(n) = 4*a(n-1)+2*a(n-2) for n > 1 with a(0)=1, a(1)=5, and g.f. is (1+x)/(1-4*x-2*x^2). [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Oct 03 2009]
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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. 78).
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CROSSREFS
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Sequence in context: A083586 A129158 A129164 this_sequence A087439 A033452 A048251
Adjacent sequences: A123344 A123345 A123346 this_sequence A123348 A123349 A123350
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Oct 10 2006
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