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) =1a(2) =1a(3) =2a(4) =3a(5) =4a(6) =6a(7) =9a(8) =13a(9) =20a(10) =30a(11) =45a(12) =68a(13) =103a(14) =155a(15) =235a(16) =356a(17) =539a(18) =816a(19) =1236a(20) =1873a(21) =2838a(22) =4300a(23) =6517a(24) =9877a(25) =14970a(26) =22688a(27) =34385a(28) =52115a(29) =78988