a(n) = (1/5)*s(n), where s(n) is the n-th multiple of 5 in A026166.

Terms

a(0) =2a(1) =1a(2) =4a(3) =8a(4) =3a(5) =14a(6) =5a(7) =16a(8) =6a(9) =20a(10) =7a(11) =26a(12) =9a(13) =10a(14) =32a(15) =11a(16) =34a(17) =12a(18) =38a(19) =13a(20) =44a(21) =15a(22) =50a(23) =17a(24) =52a(25) =18a(26) =56a(27) =19a(28) =58a(29) =62