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 A143675 #4 Mar 30 2012 18:52:27 %S A143675 0,81,390625,5764801,81, %T A143675 3761581922631320025499956919111186169019729781670680068828005460090935230255126953125 %N A143675 (0, 1, 2, 3, 2^2, 5, 2*3, 7, 2^3, 3^2, 2*5, 11, 2^2*3, 13,..) becomes (0^(1^2), 3^(2^2), 5^(2^3), 7^(2^3), 3^(2^2), 5^(11^2), 2^(3^13),..). %e A143675 0^(1^2)=0^1=0=a(1). %e A143675 3^(2^2)=3^4=81=a(2). %e A143675 5^(2^3)=5^8=390625=a(3). %e A143675 7^(2^3)=7^8=5764801=a(4). %e A143675 3^(2^2)=3^4=81=a(5), etc. %Y A143675 Cf. A141269, A141270. %K A143675 nonn %O A143675 1,2 %A A143675 _Juri-Stepan Gerasimov_, Nov 01 2008 %E A143675 One more term from _R. J. Mathar_, Apr 18 2010