(n-th Lucas number that is not 1) - (n-th number that is 1 or not a Lucas number).

Terms

a(0) =2a(1) =2a(2) =2a(3) =5a(4) =10a(5) =20a(6) =37a(7) =64a(8) =110a(9) =185a(10) =307a(11) =505a(12) =826a(13) =1345a(14) =2187a(15) =3550a(16) =5756a(17) =9326a(18) =15103a(19) =24451a(20) =39577a(21) =64052a(22) =103654a(23) =167731a(24) =271412a(25) =439172a(26) =710614a(27) =1149817a(28) =1860463a(29) =3010313