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 A025131 #3 Mar 30 2012 18:56:01 %S A025131 2,24,238,2180,19184,164864,1395230,11683212,97083652,802098704, %T A025131 6597442768,54074559968,441952039104,3603658886144,29327060440350, %U A025131 238277193572828,1933262776766876 %N A025131 3rd elementary symmetric function of C(n,0), C(n,1), ..., C(n,n). %K A025131 nonn %O A025131 2,1 %A A025131 _Clark Kimberling_