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 A239943 #30 Jul 05 2014 11:13:34 %S A239943 1,2,3,4,12,23,30,48,50,53,68,79,80,81,92,104,105,110,112,122,131,138, %T A239943 149,153,160,180,185,191,201,208,216,223,242,265,279,292,308,310,317, %U A239943 332,337,344,348,351,362,374,381,401,410,416,431,436,446,451,454 %N A239943 Fixed points of the permutations A239965 and A238862. %C A239943 a(n) = A239965(a(n)) = A238862(a(n)). %H A239943 Reinhard Zumkeller, <a href="/A239943/b239943.txt">Table of n, a(n) for n = 1..1000</a> %o A239943 (Haskell) %o A239943 a239943 n = a239943_list !! (n-1) %o A239943 a239943_list = [x | x <- [1..], a239965 x == x] %K A239943 nonn %O A239943 1,2 %A A239943 _Reinhard Zumkeller_, Apr 30 2014