a(n) = 1 + Product_{d|n, d < n} a(d).

Terms

a(0) =2a(1) =3a(2) =3a(3) =7a(4) =3a(5) =19a(6) =3a(7) =43a(8) =7a(9) =19a(10) =3a(11) =2395a(12) =3a(13) =19a(14) =19a(15) =1807a(16) =3a(17) =2395a(18) =3a(19) =2395a(20) =19a(21) =19a(22) =3a(23) =246546091a(24) =7a(25) =19a(26) =43a(27) =2395a(28) =3a(29) =370387