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 A383472 #17 Jul 23 2025 16:08:04
%S A383472 1,2,5,11,23,46,92,184,369,738,1477,2954,5909,11818,23637,47274,94548,
%T A383472 189096,378193,756387,1512775,3025550,6051101,12102203,24204406,
%U A383472 48408812,96817625,193635250,387270501,774541002,1549082004,3098164009,6196328018,12392656037
%N A383472 a(n) = round(Product_{k=1..n} 1 + 2^2^(-k)).
%t A383472 Floor[Product[(1+2^(2^(-k))),{k,1,n}]+1/2]
%o A383472 (PARI) a(n) = round(prod(k=1, n, 1 + 2^2^(-k))); \\ _Michel Marcus_, Apr 28 2025
%Y A383472 Cf. A215016, A014571.
%K A383472 nonn
%O A383472 0,2
%A A383472 _Greg Huber_, Apr 27 2025