Search: id:A140253
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%I A140253
%S A140253 1,1,2,7,14,31,62,127,254,511,1022,2047,4094,8191,16382
%V A140253 -1,1,2,7,14,31,62,127,254,511,1022,2047,4094,8191,16382
%N A140253 Differences are A014551,Jacobsthal-Lucas numbers. After -1, mix A083420(n), 
               2*A083420(n).
%C A140253 Second inverse binomial transform is 1, 1, 4, -2, 10, -14, 34, -62 = 
               1, A135440 signed. a(2n)+a(2n+1)= 0, 9, 45, 189 = 9*A002450.
%F A140253 a(n+1)-2a(n)=period 2:repeat 3, 0 = A010674(n+1).Also a(n)+period 2:repeat 
               2, 1 or A000034(n+1)=A000079.
%Y A140253 Sequence in context: A018437 A120739 A034791 this_sequence A018453 A000147 
               A128902
%Y A140253 Adjacent sequences: A140250 A140251 A140252 this_sequence A140254 A140255 
               A140256
%K A140253 sign,uned
%O A140253 0,3
%A A140253 Paul Curtz (bpcrtz(AT)free.fr), Jun 23 2008

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