Search: id:A141722
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%I A141722
%S A141722 1,25,121,505,2041,8185,32761,131065,524281,2097145,8388601,33554425,
%T A141722 134217721,536870905,2147483641,8589934585
%N A141722 a(n)=4a(n-1)+21.
%F A141722 a(n)=8*4^n-7. G.f.: (1+20x)/((1-x)(1-4x)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Sep 13 2008]
%Y A141722 Sequence in context: A031151 A016970 A062938 this_sequence A090159 A025283 
               A076433
%Y A141722 Adjacent sequences: A141719 A141720 A141721 this_sequence A141723 A141724 
               A141725
%K A141722 nonn
%O A141722 0,2
%A A141722 Paul Curtz (bpcrtz(AT)free.fr), Sep 12 2008
%E A141722 Edited by N. J. A. Sloane (njas(AT)research.att.com), Sep 13 2008
%E A141722 More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 13 2008

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