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 A234846 #27 Mar 21 2021 12:04:37
%S A234846 1,6,8,4,3,9,8,3,6,8,1,2,5,8,9,8,8,0,6,7,4,0,5,2,7,5,9,9,0,5,6,0,2,5,
%T A234846 6,0,2,0,3,9,2,7,4,0,4,0,0,7,2,8,6,8,8,5,8,7,0,6,1,3,2,1,6,8,1,7,3,1,
%U A234846 7,5,4,5,5,1,3,1,5,7,1,0,1,2,2,0,3,2,8
%N A234846 Decimal expansion of Sum_{n>=0} (2n)!/(n!)^3 = Sum_{n>=0} C(2n,n)/n!.
%F A234846 Equals e^2 * BesselI(0,2) = e^2 * Sum_{n>=0} 1/n!^2.
%F A234846 Equals e^4 * Sum_{n>=0} (-1)^n * C(2n,n)/n!. - _Amiram Eldar_, Nov 06 2020
%e A234846 16.843983681258...
%e A234846 Equals 1/1 + 2/1 + 24/8 + 720/216 + 40320/13824 + 3628800/1728000 + ...
%t A234846 RealDigits[E^2*BesselI[0, 2], 10, 100][[1]] (* _Amiram Eldar_, Nov 06 2020 *)
%o A234846 (PARI) exp(2)*besseli(0,2) \\ _Charles R Greathouse IV_, Feb 19 2014
%Y A234846 Cf. A000984, A070910.
%K A234846 nonn,cons
%O A234846 2,2
%A A234846 _Richard R. Forberg_, Dec 31 2013
%E A234846 More terms from _Jon E. Schoenfield_, Mar 21 2021