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 A075646 #4 Dec 05 2013 19:55:39 %S A075646 1,3,4,11,13,16,29,38,42,55,71,81,95,110,134,153,176,186,221,249,272, %T A075646 290,310,358,403,416,454,475,517,556,600,622,670,744,771,808,854,922, %U A075646 978,1013,1085,1120,1184,1252,1314,1354,1441,1489,1536,1633,1713,1753 %N A075646 (Sum of n-th group in A075643)/(n+1). %Y A075646 Cf. A075643, A075644, A075645, A075647. %K A075646 nonn %O A075646 1,2 %A A075646 _Amarnath Murthy_, Sep 30 2002 %E A075646 More terms from _David Wasserman_, Jan 22 2005