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 A057166 #13 May 01 2020 18:54:44 %S A057166 4,8,10,12,14,16,20,22,23,25,27,29,31,35,37,38,40,42,44,46,48,50,52, %T A057166 54,56,58,60,62,64,68,70,72,74,76,77,79,81,83,85,87,89,91,93,95,97,99, %U A057166 103,105,107,109,110,111,116,118,119,120,122,124,126,128 %N A057166 Indices of subtraction steps in Recamán's sequence A005132. %H A057166 Nick Hobson, <a href="/A057166/a057166.py.txt">Python program for this sequence</a> %H A057166 Colin Mallows, <a href="/A005132/a005132.jpg">Plot (jpeg) of first 10000 terms of A005132</a> %H A057166 Colin Mallows, <a href="/A005132/a005132.ps">Plot (postscript) of first 10000 terms of A005132</a> %H A057166 <a href="/index/Rea#Recaman">Index entries for sequences related to Recamán's sequence</a> %Y A057166 Cf. A005132, A057165, A057167. %K A057166 nonn %O A057166 1,1 %A A057166 _N. J. A. Sloane_, Sep 14 2000