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 A049815 #7 Dec 29 2023 11:19:52
%S A049815 2,5,10,16,26,34,50,63,82,98,127,144,181,205,237,268,320,347,407,442,
%T A049815 493,537,613,651,729,782,855,911,1014,1057,1170,1240,1331,1405,1512,
%U A049815 1574,1716,1801,1911,1992,2152,2219,2389,2487
%N A049815 a(n) = Sum_{k=1..n} T(n,k), array T as in A049805.
%Y A049815 Cf. A049805.
%K A049815 nonn
%O A049815 1,1
%A A049815 _Clark Kimberling_