a(n) is the largest integer with distinct digits whose digital sum is n.

Terms

a(0) =0a(1) =10a(2) =20a(3) =210a(4) =310a(5) =410a(6) =3210a(7) =4210a(8) =5210a(9) =6210a(10) =43210a(11) =53210a(12) =63210a(13) =73210a(14) =83210a(15) =543210a(16) =643210a(17) =743210a(18) =843210a(19) =943210a(20) =953210a(21) =6543210a(22) =7543210a(23) =8543210a(24) =9543210a(25) =9643210a(26) =9743210a(27) =9843210a(28) =76543210a(29) =86543210