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 A134802 #6 May 10 2021 19:29:08
%S A134802 1,12,123,1235,12357,1235711,123571115,12357111522,1235711152230,
%T A134802 123571115223042,12357111522304256,1235711152230425677,
%U A134802 1235711152230425677101,1235711152230425677101135
%N A134802 Concatenation of first n partition numbers of positive integers.
%t A134802 Module[{nn=20,p},p=PartitionsP[Range[nn]];Table[FromDigits[Flatten[ IntegerDigits/@ Take[p,n]]],{n,nn}]] (* _Harvey P. Dale_, May 10 2021 *)
%Y A134802 Cf. A007908, A019518. Partition numbers: A000041. See A132926 for another version of the concatenation of first n partition numbers.
%K A134802 easy,nonn,base
%O A134802 1,2
%A A134802 _Omar E. Pol_, Nov 12 2007
%E A134802 Edited by _Charles R Greathouse IV_, Apr 25 2010