G.f.: Product_{n >= 0} (1+x^(2n+1))/(1-x^(2n+1)).

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =6a(5) =8a(6) =12a(7) =16a(8) =22a(9) =30a(10) =40a(11) =52a(12) =68a(13) =88a(14) =112a(15) =144a(16) =182a(17) =228a(18) =286a(19) =356a(20) =440a(21) =544a(22) =668a(23) =816a(24) =996a(25) =1210a(26) =1464a(27) =1768a(28) =2128a(29) =2552