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 A347952 #26 Oct 24 2021 08:44:41
%S A347952 2,1,6,5,3,8,2,2,1,5,3,2,6,9,3,6,3,5,9,4,2,0,9,8,6,3,4,8,4,9,2,4,3,0,
%T A347952 5,6,8,3,8,1,4,2,0,7,6,7,7,4,1,4,4,3,6,9,0,2,3,0,1,3,9,1,7,1,8,9,4,9,
%U A347952 4,2,4,2,5,7,9,7,7,9,8,7,1,7,9,7,6,9,2,6,0,3,5,1,4,1,5,5,6,7,5,7,2,6,7,6,4,7,5,3,4,8
%N A347952 Decimal expansion of exp(1) * (gamma - Ei(-1)).
%F A347952 Equals Sum_{k>=1} H(k) / k!, where H(k) is the k-th harmonic number.
%F A347952 Equals -Integral_{x=0..1} exp(x)*log(1-x) dx. - _Amiram Eldar_, Oct 23 2021
%e A347952 2.16538221532693635942098634849243056838142076774144369...
%t A347952 RealDigits[Exp[1] (EulerGamma - ExpIntegralEi[-1]), 10, 110] [[1]]
%o A347952 (PARI) exp(1)*(Euler + eint1(1)) \\ _Michel Marcus_, Oct 24 2021
%Y A347952 Cf. A001008, A001113, A001620, A002805, A073003, A099285, A239069, A244274, A348573.
%K A347952 nonn,cons
%O A347952 1,1
%A A347952 _Ilya Gutkovskiy_, Oct 23 2021