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 A070632 #9 Jun 13 2024 07:44:09
%S A070632 1,19,1657009,9950006745799417075771,
%T A070632 19389268200585836264288587113776883575610248525384021488302948711030121
%N A070632 a(n) = (2^(3^n)+1)/3^(n+1).
%t A070632 Table[(2^(3^n) + 1)/3^(n + 1), {n, 6}] (* _Wesley Ivan Hurt_, Dec 26 2023 *)
%K A070632 easy,nonn
%O A070632 1,2
%A A070632 _Benoit Cloitre_, May 13 2002
%E A070632 One more term from _Benoit Cloitre_, Nov 01 2002