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 A121520 #49 Mar 02 2025 08:02:21
%S A121520 1,11,10201,1003003001,10004000600040001,10000500010000100000500001,
%T A121520 1000006000015000020000015000006000001,
%U A121520 10000007000002100000350000035000002100000070000001,10000000800000028000000560000007000000056000000280000000800000001
%N A121520 a(n) = (10^n+1)^n.
%H A121520 Vincenzo Librandi, <a href="/A121520/b121520.txt">Table of n, a(n) for n = 0..30</a>
%t A121520 Table[(10^n + 1)^n, {n, 0, 25}] (* _Vincenzo Librandi_, May 26 2016 *)
%o A121520 (Magma) [(10^n+1)^n: n in [0..10]]; // _Vincenzo Librandi_, May 26 2016
%o A121520 (PARI) a(n) = (10^n+1)^n; \\ _Michel Marcus_, Feb 11 2025
%Y A121520 Cf. A121521.
%K A121520 easy,nonn
%O A121520 0,2
%A A121520 _Jason Earls_, Aug 05 2006