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 A049724 #9 Aug 07 2021 01:13:00
%S A049724 1,8,24,62,117,210,339,498,708,1002,1328,1730,2185,2752,3404,4140,
%T A049724 4958,5902,6947,8136,9423,10826,12406,14114,15919,17948,20141,22494,
%U A049724 24970,27670,30548,33624,36847,40442,44095,47946
%N A049724 a(n) = Sum_{i=0..n} T(i,n-i), array T as in A049723.
%K A049724 nonn
%O A049724 0,2
%A A049724 _Clark Kimberling_