a(n) = [ a(n-1)/a(1) ] + [ a(n-3)/a(3) ] + [ a(n-5)/a(5) ] + ..., for n >= 3.

Terms

a(0) =1a(1) =3a(2) =3a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =11a(10) =14a(11) =17a(12) =21a(13) =28a(14) =36a(15) =47a(16) =61a(17) =81a(18) =106a(19) =139a(20) =183a(21) =242a(22) =319a(23) =421a(24) =555a(25) =733a(26) =970a(27) =1282a(28) =1695a(29) =2241