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A125068 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. 0
4, 14, 45, 128, 368, 979, 2601, 6776, 17641, 45690, 118956, 309482, 808323, 2119187 (list; graph; refs; listen; history; text; internal format)
OFFSET

8,1

COMMENTS

See Equation 6 on page 1862.

REFERENCES

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.

LINKS

Table of n, a(n) for n=8..21.

EXAMPLE

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.

CROSSREFS

Cf. A121223.

Sequence in context: A083377 A047115 A208666 * A184138 A318019 A182902

Adjacent sequences:  A125065 A125066 A125067 * A125069 A125070 A125071

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi, Jan 09 2007

STATUS

approved

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Last modified June 13 11:39 EDT 2021. Contains 344992 sequences. (Running on oeis4.)