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 A019691 #29 Sep 30 2022 23:08:52
%S A019691 1,3,0,8,9,9,6,9,3,8,9,9,5,7,4,7,1,8,2,6,9,2,7,6,8,0,7,6,3,6,6,4,5,9,
%T A019691 5,3,5,0,8,2,1,5,3,9,1,6,4,0,6,2,9,4,0,9,2,0,7,2,8,9,3,5,8,0,1,2,8,2,
%U A019691 5,6,8,3,5,9,5,2,5,8,7,0,8,2,7,6,1,6,8,1,1,7,7,2,2,5,8,8,2,1,1
%N A019691 Decimal expansion of Pi/24.
%C A019691 With a different offset, also decimal expansion of 5*Pi/12, 25*Pi/6 or 125*Pi/3. - _Michel Marcus_, Sep 09 2013
%C A019691 Volume of a quarter sphere of diameter 1. - _Omar E. Pol_, Aug 19 2019
%H A019691 Ivan Panchenko, <a href="/A019691/b019691.txt">Table of n, a(n) for n = 0..1000</a>
%H A019691 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%F A019691 Equals A019673/4 or A019675/3 or A019679/2. - _Omar E. Pol_, Aug 19 2019
%F A019691 Equals (1/10) * Sum_{k>=1} sin(k*Pi/6)/k. - _Amiram Eldar_, May 30 2021
%e A019691 0.13089969389957471826927680763664595350821539164062940920728935801282...
%t A019691 RealDigits[N[Pi/24,6! ]] (* _Vladimir Joseph Stephan Orlovsky_, Dec 02 2009 *)
%o A019691 (PARI) Pi/24 \\ _Charles R Greathouse IV_, Sep 09 2013
%Y A019691 Cf. A000796, A019670, A019673, A019675, A019679.
%K A019691 nonn,cons
%O A019691 0,2
%A A019691 _N. J. A. Sloane_