Lucas numbers (beginning with 1): L(n) = L(n-1) + L(n-2) with L(1) = 1, L(2) = 3.

Terms

a(0) =1a(1) =3a(2) =4a(3) =7a(4) =11a(5) =18a(6) =29a(7) =47a(8) =76a(9) =123a(10) =199a(11) =322a(12) =521a(13) =843a(14) =1364a(15) =2207a(16) =3571a(17) =5778a(18) =9349a(19) =15127a(20) =24476a(21) =39603a(22) =64079a(23) =103682a(24) =167761a(25) =271443a(26) =439204a(27) =710647a(28) =1149851a(29) =1860498