A052216 - OEIS

A052216 as a simple table

n	a(n)
1	2
2	11
3	20
4	101
5	110
6	200
7	1001
8	1010
9	1100
10	2000
11	10001
12	10010
13	10100
14	11000
15	20000
16	100001
17	100010
18	100100
19	101000
20	110000
21	200000
22	1000001
23	1000010
24	1000100
25	1001000
26	1010000
27	1100000
28	2000000
29	10000001
30	10000010
31	10000100
32	10001000
33	10010000
34	10100000
35	11000000
36	20000000

[2,11,20,101,110,200,1001,1010,1100,2000,10001, 10010,10100,11000,20000,100001,100010,100100, 101000,110000,200000,1000001,1000010,1000100, 1001000,1010000,1100000,2000000,10000001,10000010, 10000100,10001000,10010000,10100000,11000000, 20000000]