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 A347903 #7 Feb 16 2025 08:34:02
%S A347903 1,8,7,6,9,3,9,6,2,6,7,4,5,3,8,9,2,0,0,0,4,3,1,9,0,3,8,1,1,1,0,7,3,0,
%T A347903 0,2,8,5,0,1,5,0,3,2,7,8,3,7,4,2,3,5,3,7,2,1,1,9,9,4,9,8,8,5,3,1,1,6,
%U A347903 2,3,6,6,1,7,6,7,0,1,8,5,8,6,8,3,3,6,4
%N A347903 Decimal expansion of the surface area of the unit trihyperboloid.
%H A347903 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Trihyperboloid.html">Trihyperboloid</a>
%F A347903 Can be given as a closed-form expression involving logs, polylogs, and polygammas (which probably simplifies further).
%e A347903 18.769396267453...
%t A347903 First[RealDigits[N[24(Sqrt[3]-1)-2Pi+12Sqrt[2]Re[NIntegrate[ArcTanh[x]/((2x^2-1)Sqrt[(1-x^(-2))/2]),{x,Sqrt[3/2],Infinity},WorkingPrecision->100]],90]]] (* _Stefano Spezia_, Sep 19 2021 *)
%Y A347903 Cf. A257872 (volume of the unit trihyperboloid).
%K A347903 nonn,cons
%O A347903 2,2
%A A347903 _Eric W. Weisstein_, Sep 18 2021