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 A057727 #6 Jan 01 2021 14:56:24 %S A057727 5,11,83,6563,43046723,1853020188851843, %T A057727 3433683820292512484657849089283, %U A057727 11790184577738583171520872861412518665678211592275841109096963 %N A057727 3^(2^n) + 2. %t A057727 3^2^Range[0,10]+2 (* _Harvey P. Dale_, Jan 01 2021 *) %Y A057727 Cf. A057726. %K A057727 easy,nonn %O A057727 0,1 %A A057727 _G. L. Honaker, Jr._, Oct 28 2000