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 A112856 #4 Aug 02 2022 13:28:26
%S A112856 3,13,30241,670442572801,20007974164906320568399715106816000001,
%T A112856 31370018474571622355156067715319586116075520000001
%N A112856 Primes of the form (2*n)!/n!+1.
%C A112856 Next term (2*72)!/72!+1 has 146 decimal digits.
%t A112856 Select[Table[(2n)!/n!+1,{n,50}],PrimeQ] (* _Harvey P. Dale_, Aug 02 2022 *)
%Y A112856 Cf. A112855 n such that (2*n)!/n!+1 is prime, A112854 primes of the form (2*n)!/n!-1.
%K A112856 nonn
%O A112856 1,1
%A A112856 _Hugo Pfoertner_, Sep 25 2005