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 A121246 #16 Jan 30 2017 20:50:17
%S A121246 9,73,623,5319,45418,387853,3312154,28284913,241545634,2062735515,
%T A121246 17615213066,150429237854,1284625710592,10970362144063,93683977036771,
%U A121246 800036264817078,6832097070038331,58344293161634134,498244757010106386
%N A121246 a(n) = ceiling((Pi^n)*(e^n)).
%H A121246 Vincenzo Librandi, <a href="/A121246/b121246.txt">Table of n, a(n) for n = 1..1000</a>
%p A121246 A121246:=n->ceil((Pi^n)*(exp(1)^n)): seq(A121246(n), n=1..30); # _Wesley Ivan Hurt_, Jan 30 2017
%t A121246 Table[Ceiling[Pi^n E^n],{n,20}] (* _Harvey P. Dale_, Aug 20 2012 *)
%Y A121246 Cf. A019609, A062541.
%K A121246 nonn,easy,less
%O A121246 1,1
%A A121246 _Mohammad K. Azarian_, Aug 22 2006