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 A121513 #3 Mar 30 2012 18:40:38 %S A121513 1,61,181,349,685,1045,1549,2209,2929,3889,4969,6061,7381,8725,10645, %T A121513 12805,14989,17437,19957,22645,25645,29065,32665,36505,40585,45445, %U A121513 50341,55381,60757,66373,72133,78181,84253,91093,98293,105793,113353 %N A121513 Partial sums of orders of finite perfect groups (A060793). %F A121513 a(n) = SUM[i=1..n]A060793(i). %Y A121513 Cf. A060793. %K A121513 nonn %O A121513 1,2 %A A121513 _Jonathan Vos Post_, Sep 07 2006