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 A121247 #13 Jun 22 2013 16:05:58
%S A121247 3,39,837,24936,956311,44854574,2487341345,159191134379,
%T A121247 11548655840413,936480474760830,83939839868599397,8240876863689762814,
%U A121247 879451562846500470846,101365628435563005374929
%N A121247 Floor((Pi*n)^n).
%H A121247 Vincenzo Librandi, <a href="/A121247/b121247.txt">Table of n, a(n) for n = 1..200</a>
%t A121247 Table[Floor[(Pi n)^n], {n, 20}] (* _Harvey P. Dale_, Nov 08 2011 *)
%Y A121247 Cf. A062541.
%K A121247 nonn,less
%O A121247 1,1
%A A121247 _Mohammad K. Azarian_, Aug 22 2006