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 A101556 #9 May 24 2018 15:55:51
%S A101556 0,1,11,110,1101,11010,110100,1101001,11010011,110100110,1101001100,
%T A101556 11010011001,110100110010,1101001100101,11010011001011,
%U A101556 110100110010110,1101001100101101,11010011001011010,110100110010110100
%N A101556 A Thue-Morse convolution.
%C A101556 A019300 in binary.
%C A101556 Convolution of A010060 and 10^n.
%H A101556 G. C. Greubel, <a href="/A101556/b101556.txt">Table of n, a(n) for n = 0..995</a>
%F A101556 a(n) = Sum_{k=0..n} A010060(n-k) * 10^k.
%t A101556 Table[Sum[ThueMorse[n - k]*10^k, {k, 0, n}], {n, 0, 50}] (* _G. C. Greubel_, May 23 2018 *)
%Y A101556 Cf. A010060, A019300.
%K A101556 easy,nonn
%O A101556 0,3
%A A101556 _Paul Barry_, Dec 06 2004