Exactly half the first a(n) terms of A022303 are 1's.

Terms

a(0) =2a(1) =4a(2) =6a(3) =10a(4) =12a(5) =14a(6) =16a(7) =18a(8) =20a(9) =22a(10) =24a(11) =26a(12) =32a(13) =34a(14) =36a(15) =38a(16) =40a(17) =42a(18) =44a(19) =46a(20) =50a(21) =52a(22) =54a(23) =56a(24) =58a(25) =60a(26) =64a(27) =66a(28) =68a(29) =70