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A125068
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Number of degeneracies on the sets of n ordinary trees with n vertices. These are the values of the Randic index, 'chi', in Table 15 of the paper by Elena V. Konstantinova and Maxim V. Vidyuk.
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0
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4, 14, 45, 128, 368, 979, 2601, 6776, 17641, 45690, 118956, 309482, 808323, 2119187
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OFFSET
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8,1
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COMMENTS
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See Equation 6 on page 1862.
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REFERENCES
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Elena V. Konstantinova and Maxim V. Vidyuk, "Discriminating tests of information and topological indices. Animals and trees", J. Chem. Inf. Comput. Sci., (2003), vol. 43, 1860-1871. See Table 15, column 11 on page 1868.
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LINKS
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Table of n, a(n) for n=8..21.
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EXAMPLE
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If n=8 then the value of the Randic index, 'chi', is 4.
If n=9 then the value of the Randic index, 'chi', is 14.
If n=10 then the value of the Randic index, 'chi', is 45.
If n=11 then the value of the Randic index, 'chi', is 128.
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CROSSREFS
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Cf. A121223.
Sequence in context: A047115 A356726 A208666 * A184138 A318019 A182902
Adjacent sequences: A125065 A125066 A125067 * A125069 A125070 A125071
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KEYWORD
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nonn
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AUTHOR
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Parthasarathy Nambi, Jan 09 2007
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STATUS
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approved
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