%I A002494 M1762 N0699
%S A002494 1,0,1,2,7,23,122,888,11302,262322,11730500,1006992696,164072174728,
%T A002494 50336940195360,29003653625867536,31397431814147073280,
%U A002494 63969589218557753586160,245871863137828405125824848
%N A002494 Number of n-node graphs without isolated nodes.
%D A002494 P. C. Fishburn and W. V. Gehrlein, Niche numbers, J. Graph Theory, 16 
               (1992), 131-139.
%D A002494 F. Harary, Graph Theory. Addison-Wesley, Reading, MA, 1969, p. 214.
%D A002494 W. L. Kocay, Some new methods in reconstruction theory, Combinatorial 
               Mathematics IX, 952 (1982) 89--114. [From Benoit Jubin (benoit_jubin(AT)yahoo.fr), 
               Sep 06 2008]
%D A002494 W. L. Kocay, On reconstructing spanning subgraphs, Ars Combinatoria, 
               11 (1981) 301--313. [From Benoit Jubin (benoit_jubin(AT)yahoo.fr), 
               Sep 06 2008]
%D A002494 J. H. Redfield, The theory of group-reduced distributions, Amer. J. Math., 
               49 (1927), 433-435; reprinted in P. A. MacMahon, Coll. Papers I, 
               pp. 805-827.
%D A002494 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002494 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A002494 T. D. Noe, <a href="b002494.txt">Table of n, a(n) for n=0..75</a> (using 
               A000088)
%H A002494 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               IsolatedPoint.html">Link to a section of The World of Mathematics.</
               a>
%H A002494 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               GraphicalPartition.html">Graphical Partition</a>
%t A002494 << MathWorld`Graphs`
%t A002494 Length /@ (gp = Select[ #, GraphicalPartitionQ] & /@
%t A002494 Graphs /@ Range[9])
%Y A002494 Equals first differences of A000088. Cf. A006129.
%Y A002494 Cf. also A006647-A006651.
%Y A002494 Sequence in context: A006986 A000903 A049021 this_sequence A032264 A139522 
               A163158
%Y A002494 Adjacent sequences: A002491 A002492 A002493 this_sequence A002495 A002496 
               A002497
%K A002494 nonn,nice
%O A002494 0,4
%A A002494 N. J. A. Sloane (njas(AT)research.att.com).
%E A002494 More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 10 2000
%E A002494 a(0) added by David Wilson, Aug 24 2008