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

Terms

a(0) =3a(1) =8a(2) =11a(3) =14a(4) =19a(5) =24a(6) =29a(7) =32a(8) =35a(9) =40a(10) =43a(11) =46a(12) =51a(13) =54a(14) =57a(15) =62a(16) =67a(17) =72a(18) =75a(19) =78a(20) =83a(21) =88a(22) =93a(23) =96a(24) =99a(25) =104a(26) =109a(27) =114a(28) =117a(29) =120