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 A174866 #10 Aug 28 2020 06:19:25
%S A174866 3,9,20,32,46,65,86,108,132,159,189,222,257,295,337,380,424,470,518,
%T A174866 569,623,679,736,795,857,923,990,1059,1129,1204,1280,1357,1435,1518,
%U A174866 1602,1688,1776,1867,1960,2054,2150,2249,2351,2456,2563,2671,2781,2895,3010,3128,3248,3371,3497,3626,3757,3889,4022,4156,4294,4433,4573,4714,4856
%N A174866 Partial sums of A000419.
%F A174866 a(n) = Sum_{i=1..n} A000419(i).
%Y A174866 Cf. A000419.
%K A174866 nonn
%O A174866 1,1
%A A174866 _Jonathan Vos Post_, Dec 01 2010
%E A174866 a(41) corrected by _Georg Fischer_, Aug 28 2020