

A125081


Number of degeneracies on the sets of n ordinary trees with n vertices. These are the values of the Wiener number, W, in Table 15 of the paper by Elena V. Konstantinova and Maxim V. Vidyuk.


0



4, 6, 39, 83, 221, 528, 1286, 3131, 7724, 19289, 48610, 123832, 317932, 823029, 2144486
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OFFSET

7,1


COMMENTS

See Equation 2 on page 1861 of the paper by Elena V. Konstantinova and Maxim V. Vidyuk.


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, 18601871. See Table 15, column 13 on page 1868.


LINKS

Table of n, a(n) for n=7..21.


EXAMPLE

If n=7 then the value of the Wiener number, W, is 4.
If n=8 then the value of the Wiener number, W, is 6.
If n=9 then the value of the Wiener number, W, is 39.
If n=10 then the value of the Wiener number, W, is 83.


CROSSREFS

Cf. A121223.
Sequence in context: A056315 A103234 A074061 * A175349 A281223 A023644
Adjacent sequences: A125078 A125079 A125080 * A125082 A125083 A125084


KEYWORD

nonn


AUTHOR

Parthasarathy Nambi, Jan 09 2007


STATUS

approved



