Largest prime factor of the odd Catalan number A038003(n).

Terms

a(0) =5a(1) =13a(2) =29a(3) =61a(4) =113a(5) =251a(6) =509a(7) =1021a(8) =2039a(9) =4093a(10) =8179a(11) =16381a(12) =32749a(13) =65521a(14) =131063a(15) =262139a(16) =524269a(17) =1048573a(18) =2097143a(19) =4194301a(20) =8388593a(21) =16777213a(22) =33554393a(23) =67108859a(24) =134217689a(25) =268435399a(26) =536870909a(27) =1073741789a(28) =2147483629