Duplicate of A024906.

Terms

a(0) =2a(1) =4a(2) =8a(3) =12a(4) =14a(5) =18a(6) =20a(7) =22a(8) =30a(9) =34a(10) =42a(11) =44a(12) =48a(13) =54a(14) =58a(15) =60a(16) =64a(17) =68a(18) =70a(19) =82a(20) =84a(21) =90a(22) =92a(23) =98a(24) =102