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 A055777 #22 May 16 2025 15:50:19
%S A055777 3,27,19683,7625597484987,443426488243037769948249630619149892803
%N A055777 a(n) = 3^(3^n).
%C A055777 Next term is too big to include.
%C A055777 a(n+1) = a(n) written in base 3 and read as if in base 27 (and recorded in base 10).
%C A055777 Number of distinct n-ary operators in a ternary logic. - _Ross Drewe_, Feb 13 2008
%C A055777 The next term has 116 digits. - _Harvey P. Dale_, Mar 28 2019
%H A055777 Amiram Eldar, <a href="/A055777/b055777.txt">Table of n, a(n) for n = 0..6</a>
%F A055777 a(n) = a(n-1)^3.
%F A055777 Sum_{n>=0} 1/a(n) = A383817. - _Amiram Eldar_, May 16 2025
%t A055777 NestList[#^3&,3,5] (* _Harvey P. Dale_, Mar 28 2019 *)
%o A055777 (Python)
%o A055777 print([3**(3**n) for n in range(5)]) # _Michael S. Branicky_, Mar 27 2021
%Y A055777 Cf. A001146, A023365, A383817.
%K A055777 nonn
%O A055777 0,1
%A A055777 _Henry Bottomley_, Jul 12 2000