a(n) = least positive integer > a(n-1) and not a(j)*a(k) + a(k)*a(i) + a(i)*a(j) 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) =11a(10) =12a(11) =13a(12) =15a(13) =16a(14) =18a(15) =19a(16) =21a(17) =22a(18) =24a(19) =25a(20) =27a(21) =28a(22) =30a(23) =31a(24) =33a(25) =36a(26) =37a(27) =40a(28) =42a(29) =43