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 A346436 #25 Jun 04 2023 01:43:42
%S A346436 9,9,9,9,7,5,1,9,8,4,1,2,7,4,6,2,0,7,4,7,1,7,3,4,9,6,0,5,2,8,1,0,1,7,
%T A346436 0,2,4,5,5,3,6,5,5,7,9,9,9,3,1,8,7,5,5,6,0,5,7,6,5,2,4,3,8,2,0,7,9,2,
%U A346436 3,4,9,7,5,6,4,5,0,4,8,1,1,7,6,6,1,7,2
%N A346436 Decimal expansion of the constant Sum_{k>=0} (-1)^k/(8*k)!.
%H A346436 Michael I. Shamos, <a href="http://euro.ecom.cmu.edu/people/faculty/mshamos/cat.pdf">A catalog of the real numbers</a> (2011).
%e A346436 0.9999751984127462074717349605281...
%t A346436 RealDigits[HypergeometricPFQ[{}, {1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 7/8}, -1/2^24], 10, 120][[1]] (* _Amiram Eldar_, Jun 04 2023 *)
%o A346436 (PARI) sumalt(k=0, (-1)^k/(8*k)!) \\ _Michel Marcus_, Jul 18 2021
%Y A346436 Cf. A068985, A049470, A346441, A346440, A346439, A346438, A346437, A346435, A196498.
%K A346436 cons,nonn
%O A346436 0,1
%A A346436 _Sean A. Irvine_, Jul 17 2021