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 A110730 #28 Jun 13 2021 22:16:48
%S A110730 1,1,1,2,1,1,1,2,2,3,1,1,1,1,2,2,2,3,3,4,1,1,1,1,1,2,2,2,2,3,3,3,4,4,
%T A110730 5,1,1,1,1,1,1,2,2,2,2,2,3,3,3,3,4,4,4,5,5,6,1,1,1,1,1,1,1,2,2,2,2,2,
%U A110730 2,3,3,3,3,3,4,4,4,4,5,5,5,6,6,7,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,3,3,3,3,3,3
%N A110730 Irregular triangle read by rows in which row n lists n 1's followed by (n-1) 2's followed by (n-3) 3's ... followed by 1 n.
%C A110730 From _Omar E. Pol_, May 08 2021: (Start)
%C A110730 Row n has length A000217(n).
%C A110730 Row sums give A000292, n >= 1.
%C A110730 Row n lists the terms of the n-th row A333516 in nondecreasing order.
%C A110730 (End)
%e A110730 From _Omar E. Pol_, May 08 2021: (Start)
%e A110730 Triangle begins:
%e A110730 1;
%e A110730 1, 1, 2;
%e A110730 1, 1, 1, 2, 2, 3;
%e A110730 1, 1, 1, 1, 2, 2, 2, 3, 3, 4;
%e A110730 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, 5;
%e A110730 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 6;
%e A110730 ...
%e A110730 (End)
%t A110730 Flatten@Array[Table[Table[k,#-k+1],{k,#}]&,10] (* _Giorgos Kalogeropoulos_, Jun 08 2021 *)
%Y A110730 Cf. A004736.
%Y A110730 Cf. A000217, A000292, A333516, A345116 (mirror).
%K A110730 base,easy,tabf,nonn
%O A110730 1,4
%A A110730 _Amarnath Murthy_, Aug 09 2005
%E A110730 Name clarified by _Omar E. Pol_, Jun 08 2021