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 A080212 #3 Mar 30 2012 18:50:31 %S A080212 1,2,1,4,1,20,1,8,84,252,1,220,1,3432,455,16,1,816,1,15504,1330, %T A080212 705432,1,2024,53130,10400600,2925,1184040,1,4060,1,32,5456, %U A080212 2333606220,324632,7140,1,35345263800,9139,658008,1,11480,1,7669339132,14190 %N A080212 Binomial(n, smallest odd prime factor of n). %C A080212 For n>1: a(n)=1 iff n is prime. %Y A080212 Cf. A078701, A080211, A080213. %K A080212 nonn %O A080212 1,2 %A A080212 _Reinhard Zumkeller_, Feb 06 2003