A303500 - OEIS

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A303500 as a simple table

n	a(n)
0	2
1	21
2	210
3	2101
4	21011
5	210110
6	2101100
7	21011000
8	210110001
9	2101100011
10	21011000110
11	210110001101
12	2101100011010
13	21011000110100
14	210110001101001
15	2101100011010011
16	21011000110100110
17	210110001101001101

[2,21,210,2101,21011,210110,2101100,21011000, 210110001,2101100011,21011000110,210110001101, 2101100011010,21011000110100,210110001101001, 2101100011010011,21011000110100110, 210110001101001101]