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 A152953 #3 Mar 30 2012 17:33:56 %S A152953 6,28,496,8128,33550336,8589869056,137438691328,2305843008139952128, %T A152953 2658455991569831744654692615953842176, %U A152953 14474011154664524427946373126085988481573677491474835889066354349131199152128 %N A152953 a(n) = A136007(n)*(A136007(n)+1)/2. %C A152953 Different from A000396. %Y A152953 Cf. A000396, A136007. %K A152953 nonn %O A152953 1,1 %A A152953 _Omar E. Pol_, Dec 15 2008