a(n) is square mod a(i), i < n; a(n) nonsquare; a(1) = 2.

Terms

a(0) =2a(1) =3a(2) =6a(3) =7a(4) =15a(5) =21a(6) =30a(7) =39a(8) =51a(9) =120a(10) =204a(11) =480a(12) =816a(13) =849a(14) =2041a(15) =2185a(16) =4785a(17) =19140a(18) =21505a(19) =43065a(20) =44080a(21) =49504a(22) =59185a(23) =172260a(24) =176320a(25) =178465a(26) =236740a(27) =387585a(28) =443521a(29) =552601