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) =4a(3) =5a(4) =6a(5) =7a(6) =8a(7) =9a(8) =10a(9) =24a(10) =28a(11) =29a(12) =37a(13) =40a(14) =45a(15) =49a(16) =54a(17) =55a(18) =60a(19) =64a(20) =69a(21) =70a(22) =73a(23) =77a(24) =82a(25) =102a(26) =109a(27) =117a(28) =124a(29) =229