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 A128219 #9 Feb 08 2022 19:24:47
%S A128219 1,2,2,2,3,3,2,3,4,4,2,3,4,5,5,2,3,4,5,6,6,2,3,4,5,6,7,7,2,3,4,5,6,7,
%T A128219 8,8,2,3,4,5,6,7,8,9,9,2,3,4,5,6,7,8,9,10,10,2,3,4,5,6,7,8,9,10,11,11,
%U A128219 2,3,4,5,6,7,8,9,10,11,12,12,2,3,4,5,6
%N A128219 A000012 * A127701. a(1) = 1, a(2) = 2, a(3) = 2; by rows, n-1 terms of 2, 3, 4, ... followed by "n".
%F A128219 A000012 * A127701 as infinite lower triangular matrices.
%e A128219 First few rows of the triangle:
%e A128219 1;
%e A128219 2, 2;
%e A128219 2, 3, 3;
%e A128219 2, 3, 4, 4;
%e A128219 2, 3, 4, 5, 5;
%e A128219 2, 3, 4, 5, 6, 6;
%e A128219 2, 3, 4, 5, 6, 7, 7;
%e A128219 ...
%t A128219 trm[i_]:=Join[Range[2,i],{i}]; Flatten[Table[trm[n],{n,13}]] (* _Harvey P. Dale_, Nov 14 2012 *)
%Y A128219 Cf. A000012, A127701, A034856 (row sums), A128220.
%K A128219 nonn,tabl
%O A128219 1,2
%A A128219 _Gary W. Adamson_, Feb 19 2007