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 A049817 #14 Nov 29 2023 16:16:26
%S A049817 0,0,1,1,4,2,7,7,8,8,17,9,20,18,17,19,30,24,37,25,30,34,51,31,44,48,
%T A049817 49,45,68,42,71,59,64,72,67,57,88,82,85,71,106,72,113,89,88,106,131,
%U A049817 91,116,112,119,113,152,114,129,111,136,144,173
%N A049817 a(n) = Sum_{k=1..n} T(n,k), array T as in A049816.
%H A049817 Alois P. Heinz, <a href="/A049817/b049817.txt">Table of n, a(n) for n = 1..10000</a>
%Y A049817 Cf. A049816.
%K A049817 nonn
%O A049817 1,5
%A A049817 _Clark Kimberling_