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 A331214 #9 Jan 12 2020 14:42:37
%S A331214 12,13,14,15,16,17,18,21,23,24,25,26,27,29,31,32,34,35,36,38,41,42,43,
%T A331214 45,47,51,52,53,54,56,61,62,63,65,71,72,74,81,83,92,102,103,104,105,
%U A331214 106,107,108,112,113,114,115,116,117,118,120,122,123,124,125,126,127,128,132,133,134,135,136,137,138,142
%N A331214 a(n) and at least one distinct anagram of a(n) that doesn't start with a leading 0 sum up to a palindrome.
%H A331214 Rémy Sigrist, <a href="/A331214/b331214.txt">Table of n, a(n) for n = 1..10000</a>
%H A331214 Rémy Sigrist, <a href="/A331214/a331214.gp.txt">PARI program for A331214</a>
%e A331214 10 is not in the sequence although 10 + 01 = 11 because 01 starts with a leading 0;
%e A331214 11 is not in the sequence although 11 + 11 = 22 because the second 11 is not distinct from the first one;
%e A331214 12 is in the sequence as 12 + 21 = 33. Etc.
%o A331214 (PARI) See Links section.
%Y A331214 Cf. A002113, A015976 ("Reverse and add").
%K A331214 base,nonn
%O A331214 1,1
%A A331214 _Eric Angelini_, Jan 12 2020