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 A129787 #8 Sep 08 2022 08:45:30
%S A129787 3,5,9,21,49,122,313,821,2187,5905,16105,44287,122641,341641,956594,
%T A129787 2690421,7596481,21523361,61171657,174339221,498112058,1426411801,
%U A129787 4093181689,11767897354,33891544378,97764070321,282429536481
%N A129787 Ceiling(3^n/n).
%H A129787 Vincenzo Librandi, <a href="/A129787/b129787.txt">Table of n, a(n) for n = 1..1000</a>
%t A129787 Table[Ceiling[3^n / n], {n, 30}] (* _Vincenzo Librandi_, Feb 12 2013 *)
%o A129787 (Magma) [Ceiling(3^n / n): n in [1..35]]; // _Vincenzo Librandi_, Feb 12 2013
%Y A129787 Cf. A053638.
%K A129787 nonn,easy
%O A129787 1,1
%A A129787 _Mohammad K. Azarian_, May 18 2007