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 A043024 #13 Aug 22 2021 14:54:30
%S A043024 4,36,260,268,276,284,292,300,308,316,2052,2124,2196,2268,2340,2412,
%T A043024 2484,2556,16388,16452,16516,16580,16644,16708,16772,16836,16908,
%U A043024 16972,17036,17100,17164,17228,17292,17356,17428,17492
%N A043024 Base-8 palindromes that start with 4.
%H A043024 Harvey P. Dale, <a href="/A043024/b043024.txt">Table of n, a(n) for n = 1..1000</a>
%t A043024 Table[FromDigits[#,8]&/@Select[Tuples[Range[0,7],n],#[[1]]==4&&#== Reverse[ #]&],{n,5}]//Flatten (* _Harvey P. Dale_, Mar 24 2021 *)
%Y A043024 Cf. A007094.
%K A043024 nonn,base
%O A043024 1,1
%A A043024 _Clark Kimberling_