A059043 - OEIS

A059043 as a simple table

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	6
8	7
9	8
10	9
11	12
12	23
13	34
14	45
15	56
16	67
17	78
18	89
19	90
20	123
21	234
22	345
23	456
24	567
25	678
26	789
27	890
28	901
29	1234
30	2345
31	3456
32	4567
33	5678
34	6789
35	7890
36	8901
37	9012
38	12345
39	23456
40	34567
41	45678
42	56789
43	67890
44	78901
45	89012
46	90123
47	123456
48	234567
49	345678
50	456789

[0,1,2,3,4,5,6,7,8,9,12,23,34,45,56,67,78,89,90, 123,234,345,456,567,678,789,890,901,1234,2345, 3456,4567,5678,6789,7890,8901,9012,12345,23456, 34567,45678,56789,67890,78901,89012,90123,123456, 234567,345678,456789]