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 A344144 #17 Jun 12 2021 22:32:25
%S A344144 5,0,9,0,6,7,8,7,2,9,3,1,7,1,6,5,6,2,2,9,7,8,6,7,7,7,1,9,9,0,7,4,9,8,
%T A344144 4,3,7,9,7,3,8,5,1,6,8,0,2,0,9,3,7,5,6,1,6,5,2,5,1,2,7,2,4,3,1,1,0,6,
%U A344144 5,3,6,0,2,5,8,4,9,1,7,7,9,7,4,3,9,3,5
%N A344144 Decimal expansion of Sum_{n>=0} A000108(n)/n!.
%F A344144 Equals e^2 * BesselI(2,2) = A072334 * A229020. - _Amiram Eldar_, May 17 2021
%e A344144 5.09067872931716562297867771990749843797385168020937561652512724311065360258491...
%t A344144 RealDigits[E^2 * BesselI[2, 2], 10, 100][[1]] (* _Amiram Eldar_, May 17 2021 *)
%o A344144 (PARI) suminf(n=0, (2*n)!/(n!*n!*(n+1)!)) \\ _Michel Marcus_, May 16 2021
%Y A344144 Cf. A000108, A072334, A229020.
%K A344144 cons,nonn
%O A344144 1,1
%A A344144 _Ya-Ping Lu_, May 10 2021