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 A134868 #13 Mar 27 2022 18:31:55
%S A134868 1,2,2,2,2,3,2,2,3,4,2,2,3,4,5,2,2,3,4,5,6,2,2,3,4,5,6,7,2,2,3,4,5,6,
%T A134868 7,8,2,2,3,4,5,6,7,8,9,2,2,3,4,5,6,7,8,9,10,2,2,3,4,5,6,7,8,9,10,11,2,
%U A134868 2,3,4,5,6,7,8,9,10,11,12,2,2,3,4,5,6,7,8,9,10,11,12,13
%N A134868 A103451 * A002260.
%C A134868 Row sums = A134869: (1, 4, 7, 11, 16, 22, 29, ...).
%H A134868 Michael De Vlieger, <a href="/A134868/b134868.txt">Table of n, a(n) for n = 1..10000</a>
%F A134868 A103451 * A002260 as infinite lower triangular matrices.
%F A134868 Left border of A002260, (1, 1, 1, 1, ...) is replaced by (1, 2, 2, 2, ...).
%e A134868 First few rows of the triangle:
%e A134868 1;
%e A134868 2, 2;
%e A134868 2, 2, 3;
%e A134868 2, 2, 3, 4;
%e A134868 2, 2, 3, 4, 5;
%e A134868 ...
%t A134868 Table[k + Boole[k == 1 && n != 2], {n, 2, 14}, {k, n - 1}] // Flatten (* _Michael De Vlieger_, Jul 19 2016 *)
%Y A134868 Cf. A002260, A071324, A134869.
%K A134868 nonn,tabl
%O A134868 1,2
%A A134868 _Gary W. Adamson_, Nov 14 2007