%I A004103 M1942
%S A004103 2,9,56,705,19548,1419237,278474976,148192635483,213558945249402,
%T A004103 836556995284293897,8962975658381123937708,
%U A004103 264404516190234685662666051,21610417954162750247842392794292
%N A004103 Number of nets with n nodes.
%D A004103 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A004103 Harary, Frank; Palmer, Edgar M.; Robinson, Robert W.; Schwenk, Allen 
               J.; Enumeration of graphs with signed points and lines. J. Graph 
               Theory 1 (1977), no. 4, 295-308.
%D A004103 F. Harary and R. W. Robinson, Exposition of the enumeration of point-line-signed 
               graphs, pp. 19 - 33 of Proc. Second Caribbean Conference Combinatorics 
               and Computing (Bridgetown, 1977). Ed. R. C. Read and C. C. Cadogan. 
               University of the West Indies, Cave Hill Campus, Barbados, 1977. 
               vii+223 pp.
%D A004103 R. W. Robinson, personal communication.
%D A004103 R. W. Robinson, Numerical implementation of graph counting algorithms, 
               AGRC Grant, Math. Dept., Univ. Newcastle, Australia, 1976.
%H A004103 R. W. Robinson, <a href="b004103.txt">Table of n, a(n) for n = 1..22</
               a>
%Y A004103 Sequence in context: A052840 A036243 A033917 this_sequence A111545 A070075 
               A124405
%Y A004103 Adjacent sequences: A004100 A004101 A004102 this_sequence A004104 A004105 
               A004106
%K A004103 nonn
%O A004103 1,1
%A A004103 N. J. A. Sloane (njas(AT)research.att.com).