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 A346438 #22 Jun 04 2023 01:37:59
%S A346438 9,9,8,6,1,1,1,1,3,1,9,8,7,8,6,6,5,3,7,0,5,8,5,2,9,3,4,9,0,7,4,2,2,8,
%T A346438 4,7,1,9,8,3,3,3,7,6,2,8,2,0,0,4,5,7,6,4,5,1,6,5,3,6,1,5,2,6,4,9,5,4,
%U A346438 7,6,4,6,5,6,3,8,4,0,6,8,6,7,6,5,4,3,4
%N A346438 Decimal expansion of the constant Sum_{k>=0} (-1)^k/(6*k)!.
%H A346438 Michael I. Shamos, <a href="http://euro.ecom.cmu.edu/people/faculty/mshamos/cat.pdf">A catalog of the real numbers</a> (2011).
%F A346438 Equals (cos(1) + 2*cos(1/2)*cosh(sqrt(3)/2))/3. - _Amiram Eldar_, Jun 04 2023
%e A346438 0.9986111131987866537058529349...
%t A346438 RealDigits[(Cos[1] + 2*Cos[1/2]*Cosh[Sqrt[3]/2])/3, 10, 120][[1]] (* _Amiram Eldar_, Jun 04 2023 *)
%o A346438 (PARI) sumalt(k=0, (-1)^k/(6*k)!) \\ _Michel Marcus_, Jul 18 2021
%Y A346438 Cf. A068985, A049470, A346441, A346440, A346439, A346437, A346436, A346435, A196498.
%K A346438 cons,nonn
%O A346438 0,1
%A A346438 _Sean A. Irvine_, Jul 17 2021