a(0)=1; for n > 0, a(n) = least k not included earlier such that k*a(n-1) - 1 is a square.

Terms

a(0) =1a(1) =2a(2) =5a(3) =10a(4) =17a(5) =26a(6) =37a(7) =50a(8) =65a(9) =34a(10) =13a(11) =25a(12) =41a(13) =61a(14) =85a(15) =113a(16) =145a(17) =122a(18) =101a(19) =82a(20) =293a(21) =634a(22) =1105a(23) =53a(24) =109a(25) =185a(26) =74a(27) =149a(28) =250a(29) =377