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 A132938 #6 Mar 01 2020 10:52:00
%S A132938 1,11,112,1125,112515,11251552,11251552203,11251552203877,
%T A132938 112515522038774140,11251552203877414021147,
%U A132938 11251552203877414021147115975,11251552203877414021147115975678570
%N A132938 Concatenation of first n Bell numbers.
%H A132938 Harvey P. Dale, <a href="/A132938/b132938.txt">Table of n, a(n) for n = 0..48</a>
%t A132938 Module[{nn=20,b},b=BellB[Range[0,nn]];Table[FromDigits[Flatten[ IntegerDigits/@ Take[b,n]]],{n,nn}]] (* _Harvey P. Dale_, Mar 01 2020 *)
%Y A132938 Bell or exponential numbers: A000110. Cf. A007908, A019518, A059996.
%K A132938 easy,nonn,base
%O A132938 0,2
%A A132938 _Omar E. Pol_, Sep 12 2007