a(n) = a(n-1) + a(n-2) - 1.

Terms

a(0) =1a(1) =3a(2) =3a(3) =5a(4) =7a(5) =11a(6) =17a(7) =27a(8) =43a(9) =69a(10) =111a(11) =179a(12) =289a(13) =467a(14) =755a(15) =1221a(16) =1975a(17) =3195a(18) =5169a(19) =8363a(20) =13531a(21) =21893a(22) =35423a(23) =57315a(24) =92737a(25) =150051a(26) =242787a(27) =392837a(28) =635623a(29) =1028459