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 A075454 #4 Mar 30 2012 17:26:03 %S A075454 6,26,34,123,136,206,234,352,498,1012,1350,1746,2082,2192,2203,2724, %T A075454 3075,3428,4977,5804,6874,7760,8050,8146,9335,10732,12244,13874,16724, %U A075454 17500,19782,21928,24519,26948,29860,32946,35829,39254,42862,50639 %N A075454 Integer averages of two successive perfect powers (pp(n) + pp(n+1))/2. %e A075454 6 is OK because (pp(2) + pp(3))/2 = (4 + 8)/2 = 6. %K A075454 easy,nonn %O A075454 1,1 %A A075454 _Zak Seidov_, Oct 11 2002