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 A351404 #19 May 11 2022 14:49:06
%S A351404 3,9,8,7,6,1,0,8,8,1,0,8,4,1,8,8,1,2,4,0,7,4,3,0,5,4,4,4,0,0,2,7,3,0,
%T A351404 6,0,3,3,6,8,0,8,9,1,5,4,6,7,1,9,8,1,2,7,2,9,9,5,7,4,4,4,5,7,6,9,2,7,
%U A351404 9,1,7,2,0,3,6,3,8,6,0,2,9,2,5,9,7,0,6,5,4,8,4,8,7,3,7,0,2,4,9,6,5,4,4,4,3
%N A351404 Decimal expansion of Sum_{k>=1} A106400(k-1)/k.
%C A351404 Define S(j) = Sum_{k=1..2^j} A106400(k-1)/k; S(28) agrees with this constant for 104 digits. - _Jon E. Schoenfield_, Feb 22 2022
%e A351404 0.39876108810841881240743054440027306033680...
%Y A351404 Cf. A106400, A215016.
%K A351404 nonn,cons
%O A351404 0,1
%A A351404 _Albert Böschow_ and Julian Böschow, Feb 10 2022
%E A351404 More digits from _Jon E. Schoenfield_, Feb 22 2022