a(n) = A170803(n-1) + 2, with a(0) = 1, a(1) = 2.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =8a(5) =12a(6) =20a(7) =29a(8) =45a(9) =72a(10) =104a(11) =168a(12) =249a(13) =377a(14) =620a(15) =876a(16) =1388a(17) =2117a(18) =3141a(19) =5189a(20) =7376a(21) =11472a(22) =18033a(23) =26225a(24) =42609a(25) =62292a(26) =95060a(27) =154109a(28) =219645a(29) =350717