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 A082204 #10 Aug 27 2025 08:02:43
%S A082204 1,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,
%T A082204 2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,
%U A082204 2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2,3,2,2
%N A082204 Begin with a 1, then place the smallest (as far as possible distinct) digits, such that, beginning from the n-th term, n terms form a palindrome.
%H A082204 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 1).
%F A082204 a(1) = 1; for k > 0, a(3k-1) = a(3k) = 2; a(3k+1) = 3. - _David Wasserman_, Aug 19 2004
%e A082204 The first six palindromes are 1, 22, 232, 3223, 22322, 232232.
%t A082204 Join[{1},LinearRecurrence[{0, 0, 1},{2, 2, 3},104]] (* _Ray Chandler_, Aug 25 2015 *)
%Y A082204 Cf. A082205, A082206.
%Y A082204 Essentially the same as A052901.
%K A082204 base,easy,nonn,changed
%O A082204 0,2
%A A082204 _Amarnath Murthy_, Apr 10 2003
%E A082204 More terms from _David Wasserman_, Aug 19 2004