Length of n-th term of A022470.

Terms

a(0) =1a(1) =2a(2) =4a(3) =4a(4) =6a(5) =10a(6) =12a(7) =14a(8) =22a(9) =26a(10) =30a(11) =44a(12) =56a(13) =70a(14) =98a(15) =130a(16) =162a(17) =216a(18) =292a(19) =358a(20) =470a(21) =628a(22) =792a(23) =1050a(24) =1384a(25) =1788a(26) =2334a(27) =3072a(28) =3974a(29) =5162