Bisection of Lucas numbers: a(n) = L(2*n) = A000032(2*n).

Terms

a(0) =2a(1) =3a(2) =7a(3) =18a(4) =47a(5) =123a(6) =322a(7) =843a(8) =2207a(9) =5778a(10) =15127a(11) =39603a(12) =103682a(13) =271443a(14) =710647a(15) =1860498a(16) =4870847a(17) =12752043a(18) =33385282a(19) =87403803a(20) =228826127a(21) =599074578a(22) =1568397607a(23) =4106118243a(24) =10749957122a(25) =28143753123a(26) =73681302247a(27) =192900153618a(28) =505019158607