

A121221


Number of degeneracies on the sets of N ordinary trees with p vertices.


0



2, 2, 4, 15, 35, 137, 306, 1056, 2510, 8094, 21568, 66310, 183338, 545993, 1538831
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OFFSET

1,1


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 5 on page 1868.


LINKS

Table of n, a(n) for n=1..15.


EXAMPLE

If p=16 then the parameter H_lambda is 8094 which is the tenth term in the sequence. See the paper by Elena V. Konstantinova and Maxim V. Vidyuk for the definition of H_lambda.


CROSSREFS

Sequence in context: A261531 A153968 A153965 * A122598 A279069 A257609
Adjacent sequences: A121218 A121219 A121220 * A121222 A121223 A121224


KEYWORD

nonn,uned


AUTHOR

Parthasarathy Nambi, Aug 20 2006


STATUS

approved



