Largest prime factor of n! + 2n - 1.

Terms

a(0) =2a(1) =5a(2) =11a(3) =31a(4) =43a(5) =43a(6) =163a(7) =2689a(8) =362897a(9) =3628819a(10) =179a(11) =1908373a(12) =800903a(13) =101341a(14) =13999747a(15) =104099179a(17) =1300448327a(18) =356961701a(21) =11437176299a(22) =102338720137a(24) =4324853339