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A159938
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The number of homogeneous trisubstituted linear alkanes.
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0
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OFFSET
| 2,1
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COMMENTS
| See the paper by Valentin Vankov Iliev for details.
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REFERENCES
| 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
| 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
| The number of homogeneous trisubstituted linear alkane with ten carbon atoms is 426.
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CROSSREFS
| A002522, A033816
Sequence in context: A199477 A060354 A140131 * A145126 A005676 A038503
Adjacent sequences: A159935 A159936 A159937 * A159939 A159940 A159941
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KEYWORD
| nonn
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Apr 26 2009
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