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 A043264 #4 Mar 30 2012 18:56:34 %S A043264 0,1,2,3,4,2,4,6,8,2,3,4,5,6,4,5,6,7,8,6,7,8,9,10,8,9,10,11,12,2,4,6, %T A043264 8,10,4,6,8,10,12,6,8,10,12,14,8,10,12,14,16,2,3,4,5,6,4,5,6,7,8,6,7, %U A043264 8,9,10,8,9,10,11,12,10,11,12,13,14,4,5,6,7,8,6 %N A043264 Sum of the digits of the n-th base 5 palindrome. %Y A043264 A029952 (base 5 palindromes) %K A043264 nonn,base %O A043264 1,3 %A A043264 _Clark Kimberling_