a(n) = [ a(n-1)/a(1) ] + [ a(n-2)/a(2) ] + ... + [ a(1)/a(n-1) ], for n >= 3.

Terms

a(0) =2a(1) =2a(2) =2a(3) =3a(4) =3a(5) =3a(6) =3a(7) =4a(8) =6a(9) =9a(10) =13a(11) =17a(12) =23a(13) =32a(14) =45a(15) =64a(16) =90a(17) =128a(18) =182a(19) =260a(20) =369a(21) =526a(22) =749a(23) =1067a(24) =1521a(25) =2170a(26) =3094a(27) =4414a(28) =6297a(29) =8983