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 A341324 #17 Mar 03 2021 06:04:44
%S A341324 4,4,4,9,0,4,7,1,3,7,9,7,5,7,0,9,9,4,3,8,1,8,1,5,8,0,6,2,5,7,2,8,9,1,
%T A341324 7,5,7,5,9,6,0,3,6,5,8,2,2,0,3,8,4,2,5,5,7,1,7,3,0,2,4,0,2,7,4,4,8,1,
%U A341324 7,3,2,8,9,5,5,3,4,3,1,1,2,1,2,4,3,6,0,7,0,2,3,2,7,0,6,5,2,8,6,0,7,9,9,6,5,9
%N A341324 Decimal expansion of (1/4)^(4/9)^...^(n^2/(n+1)^2)^... .
%e A341324 0.4449047137975709943818158062572891757596036582203842557173...
%t A341324 digits = 120; difs = 1; sold = 0; n = 10; While[Abs[difs] > 10^(-digits - 5), s = N[n^2/(n + 1)^2, 1000]; Do[s = (m^2/(m + 1)^2)^s, {m, n - 1, 1, -1}]; difs = s - sold; sold = s; n++]; RealDigits[s, 10, 120][[1]] (* _Vaclav Kotesovec_, Feb 17 2021 *)
%Y A341324 Cf. A242759, A242760, A341325.
%K A341324 nonn,cons
%O A341324 0,1
%A A341324 _Koksal Karakus_, Feb 08 2021
%E A341324 More digits from _Alois P. Heinz_, Feb 16 2021