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%I #28 Feb 28 2021 09:52:17
%S 0,0,1,2,4,5,7,9,12,16,20,23,26,30,35,41,48,52,57,63,70,78,87,93
%N a(n) = smallest number of edges that must be removed from K_n to obtain a graceful graph.
%D G. S. Bloom and S. W. Golomb, Numbered complete graphs, unusual rulers, and assorted applications. Theory and Applications of Graphs, Lecture Notes in Math. 642, (1978), 53-65.
%D Miller, J. C. P. Difference bases. Three problems in additive number theory. Computers in number theory (Proc. Sci. Res. Council Atlas Sympos. No. 2, Oxford, 1969), pp. 299--322. Academic Press, London,1971. MR0316269 (47 #4817) - From _N. J. A. Sloane_, Jun 05 2012
%D Rhys Price Jones, Gracelessness, Proc. 10th S.-E. Conf. Combin., Graph Theory and Computing, 1979, pp. 547-552. - From _N. J. A. Sloane_, Jun 05 2012
%H G. S. Bloom and S. W. Golomb, <a href="https://doi.org/10.1109/PROC.1977.10517">Applications of numbered undirected graphs</a>, Proc. IEEE 65 (1977), 562-570.
%H <a href="/index/Go#Golomb">Index entries for sequences related to Golomb rulers</a>
%F n(n-1)/2 = a(n)+A004137(n). - _Kellen Myers_, Jun 06 2016
%Y Cf. A003022, A078106, A004137.
%K nonn,more
%O 3,4
%A _N. J. A. Sloane_, Jun 05 2012
%E a(26) using extension of A004137 from _Hugo Pfoertner_, Feb 28 2021
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