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 A172973 #8 Aug 29 2020 12:52:25 %S A172973 19,80,189,388,989,1650,2669,3730,4821,5930,7111,8712,10321,11990, %T A172973 13689,15500,17401,19400,25411,31502,37603,43802,50421,57082,63771, %U A172973 70462,77361,84352,94413,104482,114573,125264,136125,147034,158103,169784 %N A172973 Partial sums of A048890. %Y A172973 Cf. A048890. %K A172973 base,easy,nonn %O A172973 1,1 %A A172973 _Jonathan Vos Post_, Feb 06 2010 %E A172973 a(24) corrected by _Georg Fischer_, Aug 29 2020