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A121223
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Number of degeneracies on the sets of ordinary trees with n vertices according to a topological index.
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5
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2, 2, 2, 11, 25, 98, 214, 747, 1947, 6399, 16846, 55131, 150720, 462160, 1302117
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OFFSET
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7,1
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COMMENTS
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Konstantinova and Vidyuk compare various topological indices for their power to discriminate a large set of hexagonal, square and triangular lattice animals.
This here is an overview for the H_lambda^p index (a particular logarithmic weight over the layer matrix) for a test set of 11 ordinary trees (with n=7 vertices), 23 ordinary trees (with n= 8 vertices) etc. A "good" index is indicated by resulting in low degeneracies.
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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. 43 (2003), 1860-1871. See Table 15, column H_lambda^p.
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LINKS
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EXAMPLE
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For the test set of 7741 trees with n=15 vertices, the H_lambda^p index ended up in 1947 degeneracies.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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