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 A135831 #3 Mar 30 2012 16:50:47 %S A135831 0,0,0,4,10,31,175 %N A135831 Independence number of commuting graph of symmetric group S_n. %C A135831 The graph is empty for n = 0, 1 and 2, so a(n) = 0 by convention (or should it be 1?). %D A135831 A. Iranmanesh and A. Jafarzadeh, On the commuting graph associated with the symmetric and alternating groups, J. Algebra and Applic., 7 (2008), 129-146. %K A135831 nonn %O A135831 0,4 %A A135831 _N. J. A. Sloane_, Mar 06 2008