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 A049818 #11 Aug 08 2021 03:46:06
%S A049818 0,0,1,2,6,8,15,22,30,38,55,64,84,102,119,138,168,192,229,254,284,318,
%T A049818 369,400,444,492,541,586,654,696,767,826,890,962,1029,1086,1174,1256,
%U A049818 1341,1412,1518,1590,1703,1792,1880,1986,2117
%N A049818 a(n) = Sum_{k=1..n, m=1..n} T(m,k), array T as in A049816.
%Y A049818 Partial sums of A049817.
%Y A049818 Cf. A049816.
%K A049818 nonn
%O A049818 1,4
%A A049818 _Clark Kimberling_