Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #8 Jul 29 2019 19:40:01
%S 1,-3,-3,-1,-3,1,-3,-1,-1,1,-3,-1,-3,1,1,-1,-3,-1,-3,-1,1,1,-3,-1,-1,
%T 1,-1,-1,-3,-3,-3,-1,1,1,1,-1,-3,1,1,-1,-3,-3,-3,-1,-1,1,-3,-1,-1,-1,
%U 1,-1,-3,-1,1,-1,1,1,-3,-1,-3,1,-1,-1,1,-3,-3,-1,1,-3,-3,-1,-3,1,-1,-1
%N a(n) = 2*A008683 - 1.
%F a(n) = 2*A008683 - 1, where A008683 = the Mobius sequence.
%e a(5) = -3 = 2*(-1) - 1.
%Y Cf. A008683.
%K sign
%O 1,2
%A _Gary W. Adamson_, Sep 20 2007
%E More terms from _Petros Hadjicostas_, Jul 29 2019