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.

4, 14, 45, 128, 368, 979, 2601, 6776, 17641, 45690, 118956, 309482, 808323, 2119187

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: A047115 A356726 A208666 * A184138 A318019 A182902

Adjacent sequences: A125065 A125066 A125067 * A125069 A125070 A125071

Keyword

nonn

Author

Parthasarathy Nambi, Jan 09 2007

Status

approved