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 A175401 #4 Mar 14 2015 11:45:13
%S A175401 0,1,2,3,4,5,6,7,8,9,1,1,1,1,1,1,1,1,1,1,1,2,4,8,1,9,1,1,1,9,1,3,9,1,
%T A175401 8,1,1,1,1,1,1,4,1,1,1,1,1,1,1,1,1
%N A175401 Sequence of resulting numbers after 4th step of iteration defined in A175398.
%C A175401 See A175398, A175399, A175400, A175402, A175403, A175405. [_Jaroslav Krizek_, May 05 2010]
%e A175401 For n = 29: a(29) = 9 because for the number 29 there are 4 steps of defined iteration: {2^9 = 512}, {(5^1)^2 = 25}, {2^5 = 32}, {3^2 = 9} and 4th step of iteration ending with number 9.
%K A175401 nonn
%O A175401 0,3
%A A175401 _Jaroslav Krizek_, May 01 2010