Compositorial numbers (A036691) + 1.

Terms

a(0) =2a(1) =5a(2) =25a(3) =193a(4) =1729a(5) =17281a(6) =207361a(7) =2903041a(8) =43545601a(9) =696729601a(10) =12541132801a(11) =250822656001