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) =3a(2) =4a(3) =5a(4) =6a(5) =8a(6) =11a(7) =15a(8) =20a(9) =23a(10) =26a(11) =27a(12) =30a(13) =31a(14) =41a(15) =56a(16) =71a(17) =72a(18) =75a(19) =76a(20) =95a(21) =98a(22) =101a(23) =102a(24) =116a(25) =117a(26) =120a(27) =156a(28) =159a(29) =161