Odd numbers in A138123.

Terms

a(0) =1a(1) =3a(2) =7a(3) =11a(4) =17a(5) =29a(6) =47a(7) =75a(8) =123a(9) =199a(10) =321a(11) =521a(12) =843a(13) =1363a(14) =2207a(15) =3571a(16) =5777a(17) =9349a(18) =15127a(19) =24475a(20) =39603a(21) =64079a(22) =103681a(23) =167761a(24) =271443a(25) =439203a(26) =710647a(27) =1149851a(28) =1860497a(29) =3010349