Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #11 Mar 03 2015 00:56:51
%S 0,1,4,19,54,155,432,1252,3384,9714,26752,75836,213058,603791,1702868,
%T 4830747,13666890,38742120,109715858,310884129,880368618,2493252951,
%U 7058102770,19978082407,56531061316,159932660960,452354328946,1279190479845,3616595649500
%N Sum of all Wiener indices of "chemical" trees described by A000602(n).
%C C program, see the first Bomfim link, around the function Gen() of Gang Li & Frank Ruskey.
%D S. Wagner, Graph-theoretical enumeration and digital expansions: an analytic approach, Dissertation, Fakult. f. Tech. Math. u. Tech. Physik, Tech. Univ. Graz, Austria, Feb., 2006.
%H W. Bomfim, <a href="https://oeis.org/w/images/7/7b/FreeWiener4_2.txt">C program</a>
%H Stephan Wagner, <a href="http://www.cs.sun.ac.za/~swagner/avwiener.pdf">On the average Wiener index of degree-restricted trees</a>
%K nonn
%O 1,3
%A _N. J. A. Sloane_, Sep 23 2006
%E a(11)-a(29) from _Washington Bomfim_, Feb 24 2011