The least k for which A335884(k) = n.

Terms

a(0) =1a(1) =3a(2) =5a(3) =11a(4) =23a(5) =47a(6) =109a(7) =229a(8) =457a(9) =1033a(10) =2161a(11) =4703a(12) =10079a(13) =20663a(14) =43223a(15) =94033a(16) =208849a(17) =420457a(18) =872687a(19) =1849921a(20) =3699841a(21) =8748001a(22) =17496001a(23) =36998411