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 A049708 #8 Aug 07 2021 00:05:52
%S A049708 0,2,3,4,6,8,14,18,28,36,52,66,90,104,140,170,204,240,296,336,404,458,
%T A049708 530,602,698,772,888,994,1108,1216,1364,1476,1638,1788,1972,2156,2356,
%U A049708 2526,2766,2998,3240,3450,3740,3978,4298,4578
%N A049708 a(n) = Sum_{i=0..n} T(i,n-i), array T as in A049704.
%K A049708 nonn
%O A049708 0,2
%A A049708 _Clark Kimberling_