Search: id:A141771
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%I A141771
%S A141771 1,1,2,6,19,63,216,759,2717,9867,36244,134368,501942,1886966,7131840,27078705,
%T A141771 103221585,394827315,1514797020,5827192140,22469489130,86825411010,336145233840,
%U A141771 1303626531870,5063559897474,19695844095678,76710709889576,299125464317904
%N A141771 G.f.: (1-sqrt(1-4*x))/(2*x) + 8*x^3/((sqrt(1-4*x))*(1+sqrt(1-4*x))^3).
%D A141771 M. Bona, Permutations with one or two 132-subsequences, Discrete Math., 
               181, 1998, 267-274.
%D A141771 R. Brignall et al., Decomposing simple permutations with enumerative 
               consequences, Combinatorica, 28 (2008), 385-400.
%H A141771 Miklos Bona, <a href="http://dx.doi.org/10.1016/S0012-365X(97)00062-9">
               Permutations with one or two 132-subsequences</a>, Discrete Math., 
               181 (1998) 267-274. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Sep 18 2008]
%H A141771 R. Brignall, S. Huczynska, V. Vatter, <a href="http://dx.doi.org/10.1007/
               s00493-008-2314-0">Decomposing simple permutations with enumerative 
               consequences</a>, Combinatorica, 28 (2008) 384-400. [From R. J. Mathar 
               (mathar(AT)strw.leidenuniv.nl), Sep 18 2008]
%F A141771 a(n)=A000108(n)+A002054(n-2). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Sep 18 2008]
%Y A141771 Sequence in context: A109262 A006724 A057409 this_sequence A001170 A001168 
               A119255
%Y A141771 Adjacent sequences: A141768 A141769 A141770 this_sequence A141772 A141773 
               A141774
%K A141771 nonn
%O A141771 0,3
%A A141771 N. J. A. Sloane (njas(AT)research.att.com), Sep 18 2008

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