a(0)=0, a(1)=6, a(n)=a(n-1)+a(n-2)-1.

Terms

a(0) =0a(1) =6a(2) =5a(3) =10a(4) =14a(5) =23a(6) =36a(7) =58a(8) =93a(9) =150a(10) =242a(11) =391a(12) =632a(13) =1022a(14) =1653a(15) =2674a(16) =4326a(17) =6999a(18) =11324a(19) =18322a(20) =29645a(21) =47966a(22) =77610a(23) =125575a(24) =203184a(25) =328758a(26) =531941a(27) =860698a(28) =1392638a(29) =2253335