a(n) = A003557(A276086(A108951(n))).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =1a(5) =5a(6) =1a(7) =1a(8) =1a(9) =7a(10) =1a(11) =125a(12) =1a(13) =11a(14) =16807a(15) =15a(16) =1a(17) =35a(18) =1a(19) =343a(20) =161051a(21) =13a(22) =1a(23) =25a(24) =9317a(25) =17a(26) =1a(27) =1331a(28) =1a(29) =2401