%I A005996 M1609
%S A005996 2,6,16,30,54,84,128,180,250,330,432,546,686,840,1024,1224,
%T A005996 1458,1710,2000,2310,2662,3036,3456,3900,4394,4914,5488,
%U A005996 6090,6750,7440,8192,8976,9826,10710,11664,12654,13718
%N A005996 Number of paraffins.
%D A005996 S. M. Losanitsch, Die Isomerie-Arten bei den Homologen der Paraffin-Reihe, 
               Chem. Ber. 30 (1897), 1917-1926.
%D A005996 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%F A005996 G.f.: 2*(x^2+x+1)/(-1+x)^2/(-1+x^2)^2.
%F A005996 a(n) = 2*(A006918(n) + A006918(n-1) + A006918(n-2)), n>1. - Ralf Stephan, 
               Apr 26 2003
%Y A005996 Sequence in context: A082374 A085226 A071522 this_sequence A032091 A060354 
               A140131
%Y A005996 Adjacent sequences: A005993 A005994 A005995 this_sequence A005997 A005998 
               A005999
%K A005996 nonn,easy
%O A005996 1,1
%A A005996 N. J. A. Sloane (njas(AT)research.att.com).