Search: id:A032085
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%I A032085
%S A032085 2,1,2,6,12,28,56,120,240,496,992,2016,4032,8128,16256,32640,
%T A032085 65280,130816,261632,523776,1047552,2096128,4192256,8386560,
%U A032085 16773120,33550336,67100672,134209536,268419072,536854528
%N A032085 Number of reversible strings with n beads of 2 colors. If more than 1 
               bead, not palindromic.
%D A032085 S. J. Cyvin et al., Theory of polypentagons, J. Chem. Inf. Comput. Sci., 
               33 (1993), 466-474.
%H A032085 C. G. Bower, <a href="transforms2.html">Transforms (2)</a>
%H A032085 INRIA Algorithms Project, <a href="http://algo.inria.fr/bin/encyclopedia?Search=ECSnb&argsearch=1022">
               Encyclopedia of Combinatorial Structures 1022</a>
%F A032085 "BHK" (reversible, identity, unlabeled) transform of 2, 0, 0, 0...
%F A032085 a(n) = 2^(n-1)-2^floor((n-1)/2), n > 1. - Vladeta Jovovic (vladeta(AT)eunet.rs), 
               Nov 11 2001
%F A032085 For n>1 g.f. = 1/((1-2*x)*(1-2*x^2)) - Mohammed Bouayoun (bouyao(AT)wanadoo.fr), 
               Mar 25 2004
%Y A032085 Cf. A005418. Essentially the same as A122746.
%Y A032085 Row sums of triangle A034877.
%Y A032085 Sequence in context: A020825 A110422 A131804 this_sequence A032163 A038078 
               A000139
%Y A032085 Adjacent sequences: A032082 A032083 A032084 this_sequence A032086 A032087 
               A032088
%K A032085 nonn
%O A032085 1,1
%A A032085 Christian G. Bower (bowerc(AT)usa.net)

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