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 A043273 #8 Oct 10 2024 15:04:23
%S A043273 0,1,2,3,4,5,6,7,8,9,10,11,12,13,2,4,6,8,10,12,14,16,18,20,22,24,26,2,
%T A043273 3,4,5,6,7,8,9,10,11,12,13,14,15,4,5,6,7,8,9,10,11,12,13,14,15,16,17,
%U A043273 6,7,8,9,10,11,12,13,14,15,16,17,18,19,8,9,10
%N A043273 Sum of the digits of the n-th base 14 palindrome.
%t A043273 Table[With[{id14=IntegerDigits[n,14]},If[id14==Reverse[id14],Total[id14],Nothing]],{n,0,1000}] (* _Harvey P. Dale_, Oct 10 2024 *)
%Y A043273 A029959 (base 14 palindromes)
%K A043273 nonn,base
%O A043273 1,3
%A A043273 _Clark Kimberling_