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A290950
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
13
11
24
12
35
13
46
14
57
15
68
16
79
17
135
18
246
19
357
20
468
21
579
22
1357
23
2468
24
3579
25
13579
[1,2,3,4,5,6,7,8,9,13,24,35,46,57,68,79,135,246, 357,468,579,1357,2468,3579,13579]