a(n) = ord(2,A006935(n)/2), where ord(k,m) is the multiplicative order of k modulo m.

Terms

a(0) =1a(1) =261a(2) =165a(3) =275a(4) =13425a(5) =1485a(6) =1305a(7) =32085a(8) =825a(9) =3465a(10) =2093a(11) =3135a(12) =495a(13) =495a(14) =261a(15) =847a(16) =9405a(17) =552189a(18) =198561a(19) =261a(20) =579261a(21) =2475a(22) =6237a(23) =166725a(24) =111111a(25) =3393a(26) =3565a(27) =25245a(28) =18585a(29) =4437