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A156673 as a simple table

n a(n)
1 0
2 1
3 4
4 6
5 8
6 9
7 28
8 38
9 39
10 49
11 68
12 69
13 88
14 98
15 99
16 289
17 299
18 399
19 589
20 689
21 699
22 799
23 899
24 999
25 2899
26 3899
27 3999
28 5899
29 5999
30 6999
31 7999
32 9899
33 9999
34 19999
35 29999
36 39999
37 58999
38 68999
39 69999
40 88999
41 89999
42 99999
43 299899
44 299999
45 399999
46 499999
47 689999

[0,1,4,6,8,9,28,38,39,49,68,69,88,98,99,289,299,
 399,589,689,699,799,899,999,2899,3899,3999,5899,
 5999,6999,7999,9899,9999,19999,29999,39999,58999,
 68999,69999,88999,89999,99999,299899,299999,
 399999,499999,689999]

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Last modified July 14 08:33 EDT 2020. Contains 335720 sequences. (Running on oeis4.)