a(n) = ceiling(n*phi^10), where phi is the golden ratio, A001622.

Terms

a(0) =0a(1) =123a(2) =246a(3) =369a(4) =492a(5) =615a(6) =738a(7) =861a(8) =984a(9) =1107a(10) =1230a(11) =1353a(12) =1476a(13) =1599a(14) =1722a(15) =1845a(16) =1968a(17) =2091a(18) =2214a(19) =2337a(20) =2460a(21) =2583a(22) =2706a(23) =2829a(24) =2952a(25) =3075a(26) =3198a(27) =3321a(28) =3444a(29) =3567