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 A152967 #15 Sep 17 2017 22:31:20
%S A152967 0,0,0,1,1,4,4,8,10,15,15,26,26,33,39,50,50,66,66,83,91,102,102,131,
%T A152967 135,148,158,181,181,216,216,242,254,271,281,328,328,347,361,404,404,
%U A152967 451,451,486,514,537,537,604,610,648,666,707,707,766,780,837,857,886,886,983,983
%N A152967 Partial sums of A152770.
%H A152967 B. D. Swan, <a href="/A152967/b152967.txt">Table of n, a(n) for n=1..10000</a>
%F A152967 a(n) = Sum_{i=1..n} (i-1)*floor((n-i)/i). - _Wesley Ivan Hurt_, Sep 13 2017
%t A152967 Accumulate[Array[DivisorSigma[1,#]-DivisorSigma[0,#]-#+1&,70]] (* _Harvey P. Dale_, Dec 27 2011 *)
%Y A152967 Cf. A152770.
%K A152967 easy,nonn
%O A152967 1,6
%A A152967 _Omar E. Pol_, Dec 22 2008