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 A295509 #6 Nov 28 2017 11:36:33 %S A295509 2,3,7,17,241,199,647,1117,4231,8161,15361,28057,67801,308509,263101, %T A295509 515089,1525921,2103817,3376459 %N A295509 Maxima of the numerators (and also of the denominators) of row n in the Schinzel-Sierpinski tree of fractions A295511. %o A295509 (Sage) %o A295509 def A295509(n): %o A295509 return max(A295510_row(n)) %o A295509 [A295509(n) for n in (1..10)] %Y A295509 Cf. A295510, A295511, A295512. %K A295509 nonn,more %O A295509 1,1 %A A295509 _Peter Luschny_, Nov 24 2017