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 A127398 #6 Apr 09 2014 10:12:24 %S A127398 0,1,4,8,9,16,25,27,16,8,16,25,32,25,27,49,64,81,100,64,27,25,16,25, %T A127398 49,64,81,100,81,49,64,81,64,49,64,81,64,49,64,81,64,49,64,81,64,49, %U A127398 64,81,100,121,125,121,125,121,125,121,100,81,100,121,125,144,125,121,128,121 %N A127398 a(0)=0; a(n) = A127397(n-1)+A127397(n), which is j^k, j = any positive integer, k = any integer >= 2. %Y A127398 Cf. A127397. %K A127398 nonn %O A127398 0,3 %A A127398 _Leroy Quet_, Jan 12 2007 %E A127398 Extended by _Ray Chandler_, Jan 22 2007