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 A152828 #5 Jul 22 2024 13:50:10
%S A152828 1,1,1,1,1,1,1,1,1,1,2,1,1,2,1,1,2,1,1,3,3,1,1,3,3,1,1,3,3,1,1,4,6,4,
%T A152828 1,1,4,6,4,1,1,4,6,4,1,1,5,10,10,5,1,1,5,10,10,5,1,1,5,10,10,5,1,1,6,
%U A152828 15,20,15,6,1,1,6,15,20,15,6,1,1,6,15,20,15,6,1,1,7,21,35,35,21,7,1,1,7,21
%N A152828 Triangle read by rows, A007318 rows repeated three times .
%C A152828 Diagonal sums : A079398 . Lengths of row are : 1,1,1,2,2,2,3,3,3,4,4,4,5,5,5,... (A008620) .
%e A152828 Triangle begins : 1 ; 1 ; 1 ; 1,1 ; 1,1 ; 1,1 ; 1,2,1 ; 1,2,1 ; 1,2,1 ; 1,3,3,1 ; 1,3,3,1 ; 1,3,3,1 ; 1,4,6,4,1 ; ...
%t A152828 {#,#,#}&/@Table[Binomial[n,k],{n,0,11},{k,0,n}]//Flatten (* _Harvey P. Dale_, Jul 22 2024 *)
%Y A152828 Cf. A007318, A152198, A152815
%K A152828 easy,nonn,tabf
%O A152828 0,11
%A A152828 _Philippe Deléham_, Dec 13 2008