A004658 - OEIS

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A004658 as a simple table

n	a(n)
0	1
1	3
2	21
3	123
4	1101
5	3303
6	23121
7	202023
8	1212201
9	10303203
10	32122221
11	223033323
12	2001233301
13	12011033103
14	102033231321
15	312233021223
16	2210031131001
17	13230220113003
18	113011321011021
19	1011101223033123

[1,3,21,123,1101,3303,23121,202023,1212201, 10303203,32122221,223033323,2001233301, 12011033103,102033231321,312233021223, 2210031131001,13230220113003,113011321011021, 1011101223033123]