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 A338098 #12 Oct 13 2020 15:43:43 %S A338098 0,2,2,4,4,6,4,6,4,4,8,12,20,10,14,16,14,14,20,14,20,20,24,18,22,24, %T A338098 44,36,28,32,14,24,32,40,30,52,50,48,34,30,28,44,42,50,48,56,54,40,42, %U A338098 48,48,60,48,54,54,72,56,52,50,52,40,72,44,64,48,70,78,64 %N A338098 First differences of A338097. %C A338098 All terms are even for symmetry reasons. %H A338098 Rémy Sigrist, <a href="/A338098/b338098.txt">Table of n, a(n) for n = 0..8192</a> %H A338098 Rémy Sigrist, <a href="/A338098/a338098_1.png">Illustration of initial terms</a> %H A338098 Rémy Sigrist, <a href="/A338098/a338098.gp.txt">PARI program for A338098</a> %H A338098 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a> %o A338098 (PARI) See Links section. %Y A338098 Cf. A338097. %K A338098 nonn %O A338098 0,2 %A A338098 _Rémy Sigrist_, Oct 10 2020