This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A026535 #12 Oct 07 2019 14:47:56 %S A026535 2,1,2,2,2,2,2,1,2,1,1,2,2,1,1,2,2,1,2,1,1,1,1,1,2,1,2,1,1,2,2,1,2,1, %T A026535 2,2,2,2,2,2,1,2,2,1,1,1,1,2,2,1,2,2,2,2,2,2,1,2,1,2,2,1,1,2,2,1,2,2, %U A026535 2,2,2,1,2,1,1,2,2,2,2,1,1,2,1,2,2,2,2,2,1,2 %N A026535 a(n) = t(1+5n) where t = A001285 (Thue-Morse sequence). %o A026535 (PARI) a(n)=1+hammingweight(5*n+1)%2 \\ _Charles R Greathouse IV_, May 09 2016 %Y A026535 Cf. A001285, A026517. %K A026535 nonn %O A026535 0,1 %A A026535 _Clark Kimberling_ %E A026535 Name and Pari corrected by _Sean A. Irvine_, Oct 06 2019