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 A170897 #21 Jan 24 2022 07:51:55 %S A170897 0,1,4,4,4,12,4,12,12,12,20,12,20,28,12,12,12,20,28,20,36,36,44,44,36, %T A170897 52,52,28,28,28,36,44,44,68,68,76,76,60,68,68,68,68,60,36,68,68,84, %U A170897 100,76,76,92,68,84,92,100,140,100,132,116,100,84,76,108,140,108,100,100,132,92,156,172,124,76,108,108,124,164,140,148,132,116,108,172,156,132,108,140,148,196 %N A170897 Number of new cells turned ON at generation n in cellular automaton described in A170896. %C A170897 First differences of A170896. See that entry for much more information. %H A170897 David Applegate, <a href="/A170897/b170897.txt">Table of n, a(n) for n = 0..260</a> (a(145) corrected by Sean A. Irvine) %H A170897 David Applegate, <a href="/A139250/a139250.anim.html">The movie version</a> %H A170897 N. J. A. Sloane, <a href="https://www.youtube.com/watch?v=9ogbsh8KuEM">Exciting Number Sequences</a> (video of talk), Mar 05 2021. %Y A170897 Cf. A170896. %K A170897 nonn %O A170897 0,3 %A A170897 _N. J. A. Sloane_, Jan 09 2010 %E A170897 Revised by _David Applegate_ and _N. J. A. Sloane_, Jan 21 2016