%I A018214
%S A018214 1,6,36,146,511,1512,4032,9752,21942,46252,92504,176484,323554,
%T A018214 572264,981024,1634776,2656511,4218786,6562556,10016006,15024009,
%U A018214 22177584,32258304,46282704,65567164,91792792,127097712,174169352
%N A018214 Alkane (or paraffin) numbers l(13,n).
%D A018214 S. M. Losanitsch, Die Isomerie-Arten bei den Homologen der Paraffin-Reihe, 
               Chem. Ber. 30 (1897), 1917-1926.
%D A018214 Winston C. Yang (paper in preparation).
%H A018214 N. J. A. Sloane, <a href="classic.html#LOSS">Classic Sequences</a>
%F A018214 l(c, r) = 1/2 C(c+r-3, r) + 1/2 d(c, r), where d(c, r) is C((c + r - 
               3)/2, r/2) if c is odd and r is even, 0 if c is even and r is odd, 
               C((c + r - 4)/2, r/2) if c is even and r is even, C((c + r - 4)/2, 
               (r - 1)/2) if c is odd and r is odd.
%Y A018214 Sequence in context: A083374 A061707 A056375 this_sequence A056268 A001117 
               A055404
%Y A018214 Adjacent sequences: A018211 A018212 A018213 this_sequence A018215 A018216 
               A018217
%K A018214 nonn
%O A018214 0,2
%A A018214 N. J. A. Sloane (njas(AT)research.att.com), Winston C. Yang (yang(AT)math.wisc.edu)