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 A145058 #7 Feb 07 2025 15:55:20 %S A145058 2,5,-6,1,21,-21,-1,2,-2,1,3,-4,1,2,75,-75,-2,-1,4,-3,-1,2,-2,1,5,-5, %T A145058 -1,2,-2,1,3,-4,1,2,7,-9,-1,2,-2,1,3,-4,1,2,5,-8,1,2,4,279,-279,-4,-2, %U A145058 -1,8,-5,-2,-1,4,-3,-1,2,-2,1,9,-7,-2,-1,4,-3,-1,2,-2,1,5,-5,-1,2,-2,1,3,-4 %N A145058 Second differences of A031443. %Y A145058 Cf. A031443. %K A145058 easy,sign,base %O A145058 1,1 %A A145058 _Reikku Kulon_, Sep 30 2008