a(n) = a(n-1) + a(n-2) + 1, with a(0) = 0 and a(1) = 10.

Terms

a(0) =0a(1) =10a(2) =11a(3) =22a(4) =34a(5) =57a(6) =92a(7) =150a(8) =243a(9) =394a(10) =638a(11) =1033a(12) =1672a(13) =2706a(14) =4379a(15) =7086a(16) =11466a(17) =18553a(18) =30020a(19) =48574a(20) =78595a(21) =127170a(22) =205766a(23) =332937a(24) =538704a(25) =871642a(26) =1410347a(27) =2281990a(28) =3692338a(29) =5974329