Even Fibbinary numbers (A003714); also a(n) = 2*Fibbinary(n).

Terms

a(0) =0a(1) =2a(2) =4a(3) =8a(4) =10a(5) =16a(6) =18a(7) =20a(8) =32a(9) =34a(10) =36a(11) =40a(12) =42a(13) =64a(14) =66a(15) =68a(16) =72a(17) =74a(18) =80a(19) =82a(20) =84a(21) =128a(22) =130a(23) =132a(24) =136a(25) =138a(26) =144a(27) =146a(28) =148a(29) =160