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A004643 as a simple table

n a(n)
0 1
1 2
2 10
3 20
4 100
5 200
6 1000
7 2000
8 10000
9 20000
10 100000
11 200000
12 1000000
13 2000000
14 10000000
15 20000000
16 100000000
17 200000000
18 1000000000
19 2000000000
20 10000000000
21 20000000000
22 100000000000
23 200000000000

[1,2,10,20,100,200,1000,2000,10000,20000,100000,
 200000,1000000,2000000,10000000,20000000,
 100000000,200000000,1000000000,2000000000,
 10000000000,20000000000,100000000000,200000000000]

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Last modified June 19 14:40 EDT 2013. Contains 226414 sequences.