If 2n = Sum 2^e(k) then a(n) = Sum e(k)^2.

Terms

a(0) =1a(1) =4a(2) =5a(3) =9a(4) =10a(5) =13a(6) =14a(7) =16a(8) =17a(9) =20a(10) =21a(11) =25a(12) =26a(13) =29a(14) =30a(15) =25a(16) =26a(17) =29a(18) =30a(19) =34a(20) =35a(21) =38a(22) =39a(23) =41a(24) =42a(25) =45a(26) =46a(27) =50a(28) =51a(29) =54