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 A129788 #13 Sep 08 2022 08:45:30
%S A129788 4,8,22,64,205,683,2341,8192,29128,104858,381301,1398102,5162221,
%T A129788 19173962,71582789,268435456,1010580541,3817748708,14467258261,
%U A129788 54975581389,209430786244,799644820201,3059510616421,11728124029611
%N A129788 a(n) = ceiling(4^n/n).
%H A129788 Vincenzo Librandi, <a href="/A129788/b129788.txt">Table of n, a(n) for n = 1..1000</a>
%t A129788 Table[Ceiling[4^n/n],{n,30}] (* _Harvey P. Dale_, Jan 21 2012 *)
%o A129788 (Magma) [Ceiling(4^n/n):n in [1..30]]; // _Vincenzo Librandi_, Oct 03 2011
%Y A129788 Cf. A053638.
%K A129788 nonn,easy
%O A129788 1,1
%A A129788 _Mohammad K. Azarian_, May 18 2007