%I A000636 M1185 N0457
%S A000636 1,2,4,9,21,52,129,332,859,2261,5983,15976,42836,115469,312246,847241,
%T A000636 2304522,6283327,17164401,46972357,128741107,353345434,970999198,2671347292,
               7356752678
%N A000636 Number of paraffins C_n H_{2n} X_2 with n carbon atoms.
%D A000636 H. R. Henze and C. M. Blair, The number of structural isomers of the 
               more important types of aliphatic compounds, J. Amer. Chem. Soc., 
               56 (1934), 157.
%D A000636 G. Polya, Algebraische Berechnung der Anzahl der Isomeren einiger organischer 
               Verbindungen, Zeit. f. Kristall., 93 (1936), 415-443; line 4 of Table 
               I.
%D A000636 R. C. Read, The Enumeration of Acyclic Chemical Compounds, pp. 25-61 
               of A. T. Balaban, ed., Chemical Applications of Graph Theory, Ac. 
               Press, 1976; see p. 28.
%D A000636 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A000636 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%Y A000636 Sequence in context: A001006 A027057 A148071 this_sequence A136753 A084261 
               A063026
%Y A000636 Adjacent sequences: A000633 A000634 A000635 this_sequence A000637 A000638 
               A000639
%K A000636 nonn,easy,nice
%O A000636 1,2
%A A000636 N. J. A. Sloane (njas(AT)research.att.com).