Odd Lucas numbers.

Terms

a(0) =1a(1) =3a(2) =7a(3) =11a(4) =29a(5) =47a(6) =123a(7) =199a(8) =521a(9) =843a(10) =2207a(11) =3571a(12) =9349a(13) =15127a(14) =39603a(15) =64079a(16) =167761a(17) =271443a(18) =710647a(19) =1149851a(20) =3010349a(21) =4870847a(22) =12752043a(23) =20633239a(24) =54018521a(25) =87403803a(26) =228826127a(27) =370248451a(28) =969323029a(29) =1568397607