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 A212004 #16 Oct 01 2022 00:58:13
%S A212004 1,5,5,8,5,4,5,4,5,6,5,4,4,0,3,8,9,9,5,7,8,3,0,4,5,3,2,3,0,1,9,2,8,1,
%T A212004 7,7,9,9,9,5,6,4,1,3,7,0,7,6,2,9,6,6,7,4,7,0,6,3,4,8,5,7,5,0,2,3,9,5,
%U A212004 3,3,6,8,7,3,0,9,2,3,5,1,3,9,0,4,1,9
%N A212004 Decimal expansion of (2*Pi)^4.
%H A212004 Juan M. Maldacena, <a href="http://arxiv.org/abs/hep-th/9711200">The Large N Limit of Superconformal Field Theories and Supergravity</a>, arXiv:hep-th/9711200v3, 1997-1998, p. 11.
%H A212004 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%F A212004 Equals Product_{k=1..15, gcd(k,15)==1} Gamma(k/15). - _Amiram Eldar_, Jun 12 2021
%e A212004 1558.545456544038995783...
%t A212004 RealDigits[(2*Pi)^4, 10, 100][[1]] (* _Amiram Eldar_, Jun 12 2021 *)
%o A212004 (PARI) 16*Pi^4 \\ _Charles R Greathouse IV_, Oct 01 2022
%Y A212004 Cf. A000796, A019692, A092425, A212002, A212003, A212005.
%K A212004 nonn,cons
%O A212004 4,2
%A A212004 _Omar E. Pol_, Aug 11 2012