a(n)=T(n,2), array T as in A049735.

Terms

a(0) =13a(1) =21a(2) =25a(3) =45a(4) =69a(5) =97a(6) =129a(7) =177a(8) =221a(9) =277a(10) =333a(11) =401a(12) =473a(13) =553a(14) =633a(15) =725a(16) =821a(17) =933a(18) =1041a(19) =1153a(20) =1273a(21) =1405a(22) =1541a(23) =1685a(24) =1829a(25) =1993a(26) =2145a(27) =2313a(28) =2477a(29) =2661