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 A168350 #3 Mar 30 2012 18:52:37
%S A168350 0,1,4,9,16,24,33,43,54,67,81,96,112,129,148,168,189,211,235,260,286,
%T A168350 313,341,370,401,433,466,500,535,571,609,648,688,729,772,816,861,907,
%U A168350 955,1004,1054,1105,1157,1211,1266,1322,1379,1437,1496,1557,1619,1682
%N A168350 Sum of first n non-single or nonisolated numbers.
%F A168350 a(n)=sum{j=1..n} A167707(j).
%e A168350 a(1)=0, a(2)=0+1=1, a(3)=0+1+3=4.
%Y A168350 Cf. A167707.
%K A168350 nonn
%O A168350 1,3
%A A168350 _Juri-Stepan Gerasimov_, Nov 23 2009
%E A168350 Formula and A-number corrected and entries checked by _R. J. Mathar_, Nov 24 2009