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 A043274 #4 Mar 30 2012 18:56:34 %S A043274 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,2,4,6,8,10,12,14,16,18,20,22,24, %T A043274 26,28,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,4,5,6,7,8,9,10,11,12,13, %U A043274 14,15,16,17,18,6,7,8,9,10,11,12,13,14,15,16,17,18 %N A043274 Sum of the digits of the n-th base 15 palindrome. %Y A043274 A029960 (base 15 palindromes) %K A043274 nonn,base %O A043274 1,3 %A A043274 _Clark Kimberling_