A224780 - OEIS

A224780 as a simple table

n	a(n)
1	123456789
2	12
3	12
4	23
5	23
6	34
7	34
8	45
9	45
10	56
11	56
12	67
13	67
14	78
15	78
16	89
17	89
18	12
19	12
20	12
21	123
22	12
23	12
24	12
25	12
26	12
27	12
28	34
29	45
30	56
31	67
32	78
33	89
34	12
35	12
36	12
37	23
38	23
39	23
40	123
41	23
42	234
43	23
44	23
45	23
46	23
47	23
48	12
49	45
50	12
51	56
52	12
53	67
54	12
55	78
56	12
57	89
58	12
59	23
60	123
61	23
62	23
63	23
64	34
65	34
66	34
67	34
68	234
69	34
70	345
71	34
72	34
73	34
74	34
75	23
76	56
77	23
78	67
79	23
80	78
81	23
82	89

[123456789,12,12,23,23,34,34,45,45,56,56,67,67,78, 78,89,89,12,12,12,123,12,12,12,12,12,12,34,45,56, 67,78,89,12,12,12,23,23,23,123,23,234,23,23,23,23, 23,12,45,12,56,12,67,12,78,12,89,12,23,123,23,23, 23,34,34,34,34,234,34,345,34,34,34,34,23,56,23,67, 23,78,23,89]

[123456789,12,12,23,23,34,34,45,45,56,56,67,67,78,
 78,89,89,12,12,12,123,12,12,12,12,12,12,34,45,56,
 67,78,89,12,12,12,23,23,23,123,23,234,23,23,23,23,
 23,12,45,12,56,12,67,12,78,12,89,12,23,123,23,23,
 23,34,34,34,34,234,34,345,34,34,34,34,23,56,23,67,
 23,78,23,89]