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 A193159 #11 Mar 30 2012 18:51:10 %S A193159 1,2,3,4,5,6,7,8,10,11,12,13,14,20,23,24,26,28,29,40,52,56,58,104,116, %T A193159 232 %N A193159 Numbers having in binary representation longest palindromic subwords not longer than 3. %C A193159 A050430(a(n)) <= 3, 1 <= n <= 26. %o A193159 (Haskell) %o A193159 a193159 n = a193159_list !! (n-1) %o A193159 a193159_list = map (+ 1) $ findIndices (<= 3) a050430_list %K A193159 nonn,base,fini,full %O A193159 1,2 %A A193159 _Reinhard Zumkeller_, Jul 16 2011