Search: id:A143795
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%I A143795
%S A143795 1,2,12,13,23,24,34,35,45,46,56,57,67,68,78,79,89,90,100,101,111,112,
%T A143795 122,123,133,134,144,145,155,156,166,167,177,178,188,189,199,200,210,
%U A143795 211,221,222,232,233,243,244,254,255,265,266,276,277,287,288,298,299
%N A143795 Start with 1; then repeatedly add 1, then add 10.
%F A143795 a(n)= (22*n-27-9*(-1)^n)/4. G.f.: x(1+x+9x^2)/((1+x)(1-x)^2). a(n)=a(n-2)+11. 
               [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 04 2008]
%F A143795 a(n)=11*n-a(n-1)-19 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Nov 27 2009]
%e A143795 For n=2, a(2)=11*2-1-19=2; n=3, a(3)=11*3-2-19=12; n=4, a(4)=11*4-12-19=13 
               [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 27 2009]
%Y A143795 Sequence in context: A028424 A037311 A031257 this_sequence A032931 A072483 
               A081539
%Y A143795 Adjacent sequences: A143792 A143793 A143794 this_sequence A143796 A143797 
               A143798
%K A143795 nonn,easy,new
%O A143795 1,2
%A A143795 Luis Farfan (ljfarfan(AT)gmail.com), Sep 01 2008
%E A143795 Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 04 2008

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