Fibonacci sequence beginning 0, 3.

Terms

a(0) =0a(1) =3a(2) =3a(3) =6a(4) =9a(5) =15a(6) =24a(7) =39a(8) =63a(9) =102a(10) =165a(11) =267a(12) =432a(13) =699a(14) =1131a(15) =1830a(16) =2961a(17) =4791a(18) =7752a(19) =12543a(20) =20295a(21) =32838a(22) =53133a(23) =85971a(24) =139104a(25) =225075a(26) =364179a(27) =589254a(28) =953433a(29) =1542687