A004669 - OEIS

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A004669 as a simple table

n	a(n)
0	1
1	3
2	9
3	10
4	30
5	90
6	100
7	300
8	900
9	1000
10	3000
11	9000
12	10000
13	30000
14	90000
15	100000
16	300000
17	900000
18	1000000
19	3000000
20	9000000
21	10000000
22	30000000
23	90000000
24	100000000
25	300000000
26	900000000
27	1000000000

[1,3,9,10,30,90,100,300,900,1000,3000,9000,10000, 30000,90000,100000,300000,900000,1000000,3000000, 9000000,10000000,30000000,90000000,100000000, 300000000,900000000,1000000000]