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 A247472 #16 Apr 26 2018 10:06:32 %S A247472 1,1,2,6,24,118,672,4255,29146,212028,1617344,12819065,104870276, %T A247472 881047470,7571873230,66363349857 %N A247472 Number of permutations of length n avoiding the patterns 14253 and 13524. %Y A247472 Cf. A164870. %K A247472 nonn,more %O A247472 0,3 %A A247472 _Nathaniel Shar_, Nov 30 2014 %E A247472 a(10)-a(15) from _Lars Blomberg_, Apr 26 2018