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 A163902 #2 Mar 31 2012 13:21:18 %S A163902 2,3,22,23,25,26,29,31,37,38,40,41,42,43,53,55,60,61,62,63,262,263, %T A163902 265,266,269,271,322,323,342,343,345,346,349,351,357,358,360,361,362, %U A163902 363,373,375,380,381,382,383,405,406,408,409,410,411,416,420,421,422 %N A163902 The positions i where A163905(i) = i, but not A163355(i) = i, that is, the 2-cycles of permutation A163355. %Y A163902 See also A163901, A163903, A163910. %K A163902 nonn %O A163902 0,1 %A A163902 _Antti Karttunen_, Sep 19 2009