A293880 - OEIS

A293880 as a simple table

n	a(n)
1	20
2	120
3	200
4	201
5	202
6	203
7	204
8	205
9	206
10	207
11	208
12	209
13	220
14	320
15	420
16	520
17	620
18	720
19	820
20	920
21	1020
22	1120
23	1200
24	1201
25	1202
26	1203
27	1204
28	1205
29	1206
30	1207
31	1208
32	1209
33	1220
34	1320
35	1420
36	1520
37	1620
38	1720
39	1820
40	1920
41	2000
42	2001
43	2002
44	2003
45	2004
46	2005
47	2006
48	2007
49	2008
50	2009
51	2010

[20,120,200,201,202,203,204,205,206,207,208,209, 220,320,420,520,620,720,820,920,1020,1120,1200, 1201,1202,1203,1204,1205,1206,1207,1208,1209,1220, 1320,1420,1520,1620,1720,1820,1920,2000,2001,2002, 2003,2004,2005,2006,2007,2008,2009,2010]