Members of A000124 which are the arithmetic mean of two other members.

Terms

a(0) =4a(1) =22a(2) =29a(3) =37a(4) =79a(5) =106a(6) =154a(7) =172a(8) =191a(9) =211a(10) =254a(11) =326a(12) =352a(13) =379a(14) =466a(15) =529a(16) =667a(17) =704a(18) =904a(19) =947a(20) =991a(21) =1036a(22) =1129a(23) =1177a(24) =1276a(25) =1379a(26) =1486a(27) =1541a(28) =1597a(29) =1654