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 A162221 #3 Mar 30 2012 17:28:42 %S A162221 1,3,1,62,243,33,922,2699,13125,40393,1,2049,1075174,6401871,1, %T A162221 57592238,129336777,516822801,1163047905,524289,1,62770507831,1, %U A162221 8388609,1,847624153770,1,53379719265825,183016755558795,411784948543867 %N A162221 Greatest integer equal to the sum of the n-th powers of its base-4 digits (written in base 10). %H A162221 Joseph Myers, <a href="/A162221/b162221.txt">Table of n, a(n) for n=0..1886</a> %Y A162221 Cf. A162219, A162220, A033836. In other bases: A162218 (base 3), A162224 (base 5), A162227 (base 6), A162230 (base 7), A162233 (base 8), A162236 (base 9), A046761 (base 10). %K A162221 base,nonn %O A162221 0,2 %A A162221 _Joseph Myers_, Jun 28 2009