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 A338358 #5 Nov 03 2020 21:47:09 %S A338358 1,2,-1,3,-1,5,-3,7,-6,1,3,-1,11,-9,13,-11,3,-2,1,17,-15,19,-18,1,3, %T A338358 -1,23,-21,5,-3,1,4,-3,29,-27,31,-29,3,-1,5,-3,37,-35,3,-1,41,-39,43, %U A338358 -42,1,3,-1,47,-45,7,-6,1,3,-2,1,53,-51,5,-3,2,59,-57,61,-59,3,-2,1,5,-3,67 %N A338358 First differences of A280985. %H A338358 N. J. A. Sloane, <a href="/A338358/b338358.txt">Table of n, a(n) for n = 1..10000</a> %Y A338358 Cf. A280985. %K A338358 sign %O A338358 1,2 %A A338358 _N. J. A. Sloane_, Nov 03 2020