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 A333938 #9 Jan 12 2024 18:03:03
%S A333938 0,7,8,8,9,8,3,5,0,0,2,1,2,4,9,1,8,1,0,0,6,4,1,8,5,9,2,0,1,2,2,9,4,7,
%T A333938 7,7,4,7,3,6,7,2,8,1,4,3,4,5,8,4,9,1,2,5,0,8,7,3,9,6,7,2,1,4,6,8,7,0,
%U A333938 4,5,6,5,7,4,5,4,2,7,2,3,4,5,9,1,3,5,5,5,0,3,8,1,4,3,9,6,5,5,7,1,5,1,6,1,4,2
%N A333938 Decimal expansion of Product_{k>=1} (1 - k/2^k).
%F A333938 Equals exp(-Sum_{j>=1} polylog(-j, 1/2^j)/j).
%e A333938 0.0788983500212491810064185920122947774736728143458491250873967214687...
%p A333938 evalf(Product(1 - k/2^k, k = 1..infinity), 100);
%t A333938 Join[{0},RealDigits[Product[1-n/2^n,{n,500}],10,120][[1]]] (* _Harvey P. Dale_, Jan 12 2024 *)
%o A333938 (PARI) prodinf(k=1, 1 - k/2^k)
%Y A333938 Cf. A048651, A065446, A277355.
%K A333938 nonn,cons
%O A333938 0,2
%A A333938 _Vaclav Kotesovec_, Apr 11 2020