a(n) = least positive integer > a(n-1) and not a(i)*a(j)-a(k) for 1<=i<j<k<=n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =8a(7) =11a(8) =15a(9) =20a(10) =23a(11) =26a(12) =27a(13) =30a(14) =31a(15) =41a(16) =56a(17) =71a(18) =72a(19) =75a(20) =76a(21) =95a(22) =98a(23) =101a(24) =102a(25) =116a(26) =117a(27) =120a(28) =156a(29) =159