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 A330420 #13 Dec 16 2019 02:19:28 %S A330420 0,1,3,0,4,9,3,11,4,22,11,2,22,9,33,11,1,22,8,33,7,22,6,33,5,22,3,33, %T A330420 4,44,11,55,9,44,8,55,7,44,6,55,5,44,3,55,4,66,111,99,131,88,111,77, %U A330420 131,191,222,161,232,151,88,141,99,44,101,33,99,171,101,22 %N A330420 Running totals in A330401. %C A330420 All terms are palindromes. %H A330420 Rémy Sigrist, <a href="/A330420/b330420.txt">Table of n, a(n) for n = 0..10000</a> %H A330420 Rémy Sigrist, <a href="/A330420/a330420.gp.txt">PARI program for A330420</a> %F A330420 A330401(n) = abs(a(n) - a(n-1)). %o A330420 (PARI) See Links section. %Y A330420 Cf. A330401. %K A330420 nonn,base %O A330420 0,3 %A A330420 _Rémy Sigrist_, Dec 14 2019