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) =8a(5) =9a(6) =18a(7) =19a(8) =29a(9) =39a(10) =40a(11) =60a(12) =70a(13) =80a(14) =81a(15) =95a(16) =123a(17) =143a(18) =144a(19) =154a(20) =164a(21) =169a(22) =174a(23) =189a(24) =217a(25) =248a(26) =258a(27) =268a(28) =273a(29) =278