A self-generating sequence (see Comments in A003156 for the definition).

Terms

a(0) =2a(1) =7a(2) =10a(3) =13a(4) =18a(5) =23a(6) =28a(7) =31a(8) =34a(9) =39a(10) =42a(11) =45a(12) =50a(13) =53a(14) =56a(15) =61a(16) =66a(17) =71a(18) =74a(19) =77a(20) =82a(21) =87a(22) =92a(23) =95a(24) =98a(25) =103a(26) =108a(27) =113a(28) =116a(29) =119