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 A049830 #11 Aug 08 2021 03:45:46
%S A049830 0,0,1,2,7,10,20,32,46,62,95,116,157,202,248,298,372,444,543,626,723,
%T A049830 834,992,1112,1260,1436,1617,1802,2045,2236,2498,2752,3034,3348,3661,
%U A049830 3954,4317,4708,5126,5512,5992,6406,6935,7432
%N A049830 a(n) = Sum_{k=1..n, m=1..k} T(m,k); array T as in A049828.
%Y A049830 Partial sums of A049829.
%Y A049830 Cf. A049828.
%K A049830 nonn
%O A049830 1,4
%A A049830 _Clark Kimberling_