Even abundant numbers divided by 2.

Terms

a(0) =6a(1) =9a(2) =10a(3) =12a(4) =15a(5) =18a(6) =20a(7) =21a(8) =24a(9) =27a(10) =28a(11) =30a(12) =33a(13) =35a(14) =36a(15) =39a(16) =40a(17) =42a(18) =44a(19) =45a(20) =48a(21) =50a(22) =51a(23) =52a(24) =54a(25) =56a(26) =57a(27) =60a(28) =63a(29) =66