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 A091482 #26 Sep 08 2022 08:45:12
%S A091482 1,3,36,729,20736,759375,34012224,1801088541,110075314176,
%T A091482 7625597484987,590490000000000,50542106513726817,4738381338321616896,
%U A091482 482880748567480579719,53148384174432398229504,6283298708943145751953125,794071845499378503449051136
%N A091482 a(n) = (3*n)^n.
%F A091482 E.g.f.: 1/(1 + LambertW(-3*x)). - _Ilya Gutkovskiy_, Oct 03 2017
%t A091482 Join[{1}, Table[(3 n)^n, {n, 20}]] (* _Vincenzo Librandi_, Jun 21 2015 *)
%o A091482 (Magma) [(3*n)^n : n in [0..20]]; // _Zaki Khandaker_, Jun 21 2015
%o A091482 (PARI) a(n) = (3*n)^n \\ _Charles R Greathouse IV_, Jun 21 2015
%Y A091482 Cf. A062971, A091483.
%K A091482 nonn,easy
%O A091482 0,2
%A A091482 _Christian G. Bower_, Jan 13 2004