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Search: id:A159938
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| A159938 |
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The number of homogeneous trisubstituted linear alkanes. |
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+0
1
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OFFSET
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2,1
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COMMENT
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See the paper by Valentin Vankov Iliev for details.
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REFERENCES
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Valentin Vankov Iliev, "A mathematical characterization of the groups of substitution isomerism of the linear alkanes", J. Math. Chem., 45 (2009), xxx-yyy. Page numbers unknown as of today as it is an 'online first' article.
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FORMULA
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a(n) = (1/3) (2 n^3 - 9 n^2 + 19 n - 12) where n is the number of carbons.
a(n)= 2*A081489(n-1) = (n-1)(2n^2-7n+12)/3. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 28 2009]
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EXAMPLE
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The number of homogeneous trisubstituted linear alkane with ten carbon atoms is 426.
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CROSSREFS
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A002522, A033816
Sequence in context: A032091 A060354 A140131 this_sequence A145126 A005676 A038503
Adjacent sequences: A159935 A159936 A159937 this_sequence A159939 A159940 A159941
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KEYWORD
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nonn
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Apr 26 2009
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