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 A106026 #4 Mar 30 2012 18:39:24 %S A106026 1,1,4,4,1,11,11,8,8,11,1,1,28,28,25,25,28,18,18,21,21,18,28,28,1,1,4, %T A106026 4,1,69,69,66,66,69,59,59,62,62,59,69,69,42,42,45,45,42,52,52,49,49, %U A106026 52,42,42,69,69,66,66,69,1,1,4,4,1,11,11,8,8,11,1,1,168,168,165,165,168,158 %N A106026 A fractal transform of Pell numbers : a(1)=1 then if b(n)<k<=b(n+1) a(k)=b(n+1)-a(k-b(n)) where b(n)=A000129(n). %C A106026 Graphs of a(k) for k=1 up to A000129(n) and n=1,2,3,... present fractal aspects. %F A106026 Among many properties a(A000129(n))=1 %Y A106026 Cf. A105669 (fractal transform of Fibonacci's numbers), A105670 (fractal transform of powers of 2), A105672(fractal transform of powers of 3). %K A106026 nonn %O A106026 1,3 %A A106026 _Benoit Cloitre_, May 05 2005