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 A112854 #2 Mar 31 2012 10:29:09 %S A112854 11,665279,3497296636753919999, %T A112854 1960781468160819415703172080467967999999 %N A112854 Primes of the form (2*n)!/n!-1. %C A112854 Next term (2*114)!/114!-1 has 254 decimal digits. %Y A112854 A112853 gives n such that (2*n)!/n!-1 is prime, A112856 gives primes of the form (2*n)!/n!+1. %K A112854 nonn %O A112854 1,1 %A A112854 _Hugo Pfoertner_, Sep 25 2005