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 A043265 #6 Apr 18 2020 12:43:46 %S A043265 0,1,2,3,4,5,2,4,6,8,10,2,3,4,5,6,7,4,5,6,7,8,9,6,7,8,9,10,11,8,9,10, %T A043265 11,12,13,10,11,12,13,14,15,2,4,6,8,10,12,4,6,8,10,12,14,6,8,10,12,14, %U A043265 16,8,10,12,14,16,18,10,12,14,16,18,20,2,3,4 %N A043265 Sum of the digits of the n-th base 6 palindrome. %t A043265 Total/@Select[IntegerDigits[#,6]&/@Range[0,2000],#==Reverse[#]&] (* _Harvey P. Dale_, Apr 18 2020 *) %Y A043265 A029953 (base 6 palindromes) %K A043265 nonn,base %O A043265 1,3 %A A043265 _Clark Kimberling_