%I #19 Jun 01 2018 04:22:38

%S 0,1,1,1,3,2,4,4,6,7,20,3,28,9,21,12,14,18,52,26,69,17,48,16,160,168

%N Number of distinct distances between n electrons in minimal energy configuration on a sphere.

%C Most of the higher terms of this sequence just refer to the best configurations known today.

%C How is this defined if the optimal configuration is not unique? - _N. J. A. Sloane_, Feb 27 2009

%H K. S. Brown, <a href="http://www.mathpages.com/home/kmath005/kmath005.htm">Min-Energy Configurations of Electrons On A Sphere</a>, MathPages.

%H R. H. Hardin, N. J. A. Sloane & W. D. Smith, <a href="http://neilsloane.com/electrons/index.html">Table of best configurations presently known</a>, Feb 1994.

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Thomson_problem">Thomson Problem</a>.

%e See Brown's web page in LINKS.

%Y Cf. A133491, A242617.

%K more,nonn

%O 1,5

%A K. S. Brown (ksbrown(AT)seanet.com)