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Number of degeneracies on the sets of n ordinary trees with n vertices. These are the values of the information index, (I^w)_D, in Table 15 of the paper by Elena V. Konstantinova and Maxim V. Vidyuk.
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%I #2 Mar 30 2012 17:25:50

%S 4,4,39,58,214,502,1621,3958,12295,30962,91967,245143,720699

%N Number of degeneracies on the sets of n ordinary trees with n vertices. These are the values of the information index, (I^w)_D, in Table 15 of the paper by Elena V. Konstantinova and Maxim V. Vidyuk.

%D 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 9 on page 1868.

%e If n=9 then the value of the information index, (I^w)_D, is 4.

%e If n=10 then the value of the information index, (I^w)_D, is 4.

%e If n=11 then the value of the information index, (I^w)_D, is 39.

%e If n=12 then the value of the information index, (I^w)_D, is 58.

%Y Cf. A121223.

%K nonn

%O 9,1

%A _Parthasarathy Nambi_, Jan 09 2007