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 A361336 #16 Apr 03 2023 02:31:57
%S A361336 0,10,11,100,1002,111,1000,10002,10001,1111,10000,100002,100001,
%T A361336 1000012,11111,100000,1000002,1000001,10000012,10000010,111111,
%U A361336 1000000,10000002,10000001,100000012,100000010,110111111,1111111,10000000,100000002,100000001,1000000012,1000000010
%N A361336 Smallest decimal number containing n palindromic substrings (Version 2). See Comments for precise definition.
%C A361336 Suppose m has decimal expansion d_1 d_2 ... d_k. A palindromic substring here is any substring d_i, d_{i+1}, ..., d_j with 1 <= i <= j <= n which is palindromic. In this version d_i can be 0 even if j>i. For example, if m = 10^3 + 1 = 1001 there are six substrings: 1, 0, 0, 1, 00, and 1001. See A361335 for Version 1.
%H A361336 Giovanni Resta, <a href="/A361336/b361336.txt">Table of n, a(n) for n = 1..99</a>
%Y A361336 Cf. A361335.
%K A361336 nonn,base
%O A361336 1,2
%A A361336 _N. J. A. Sloane_, Apr 01 2023, based on postings to the Sequence Fans Mailing list by _Eric Angelini_, Mar 28 2023 (definition), and _Giovanni Resta_, Mar 28 2023 (terms)