a(n) = smallest squarefree number not less than a(n-1)+a(n-2), a(1)=1, a(0)=0.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =5a(5) =10a(6) =15a(7) =26a(8) =41a(9) =67a(10) =109a(11) =177a(12) =286a(13) =463a(14) =749a(15) =1213a(16) =1963a(17) =3178a(18) =5141a(19) =8319a(20) =13461a(21) =21781a(22) =35242a(23) =57023a(24) =92265a(25) =149289a(26) =241554a(27) =390845a(28) =632399a(29) =1023245