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

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =4a(6) =5a(7) =7a(8) =10a(9) =13a(10) =16a(11) =21a(12) =28a(13) =35a(14) =43a(15) =55a(16) =70a(17) =86a(18) =105a(19) =130a(20) =161a(21) =196a(22) =236a(23) =287a(24) =350a(25) =420a(26) =501a(27) =602a(28) =722a(29) =858