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A081539 as a simple table

n a(n)
1 0
2 1
3 2
4 12
5 13
6 23
7 123
8 124
9 134
10 234
11 1234
12 1235
13 1245
14 1345
15 2345
16 12345
17 12346
18 12356
19 12456
20 13456
21 23456
22 123456
23 123457
24 123467
25 123567
26 124567
27 134567
28 234567
29 1234567
30 1234568
31 1234578
32 1234678
33 1235678
34 1245678
35 1345678
36 2345678

[0,1,2,12,13,23,123,124,134,234,1234,1235,1245,
 1345,2345,12345,12346,12356,12456,13456,23456,
 123456,123457,123467,123567,124567,134567,234567,
 1234567,1234568,1234578,1234678,1235678,1245678,
 1345678,2345678]

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)