A305615 - cp's OEIS frontend

A305615 Next term is the largest earlier term that would not create a repetition of an earlier subsequence of length 2, if such a number exists; otherwise it is the smallest nonnegative number not yet in the sequence.

n	a(n)
0	0
1	0
2	1
3	1
4	0
5	2
6	2
7	1
8	2
9	0
10	3
11	3
12	2
13	3
14	1
15	3
16	0
17	4
18	4
19	3
20	4
21	2
22	4
23	1
24	4
25	0
26	5
27	5
28	4
29	5
30	3
31	5
32	2
33	5
34	1
35	5
36	0
37	6
38	6
39	5
40	6
41	4
42	6
43	3
44	6
45	2
46	6
47	1
48	6
49	0
50	7
51	7
52	6
53	7
54	5
55	7
56	4
57	7
58	3
59	7
60	2
61	7
62	1
63	7
64	0
65	8
66	8
67	7
68	8
69	6
70	8
71	5
72	8
73	4
74	8
75	3
76	8
77	2
78	8
79	1
80	8
81	0
82	9
83	9
84	8
85	9
86	7
87	9
88	6
89	9
90	5
91	9
92	4
93	9
94	3
95	9
96	2
97	9
98	1
99	9
100	0

[0, 0, 1, 1, 0, 2, 2, 1, 2, 0, 3, 3, 2, 3, 1, 3, 0, 4, 4, 3, 4, 2, 4, 1, 4, 0, 5, 5, 4, 5, 3, 5, 2, 5, 1, 5, 0, 6, 6, 5, 6, 4, 6, 3, 6, 2, 6, 1, 6, 0, 7, 7, 6, 7, 5, 7, 4, 7, 3, 7, 2, 7, 1, 7, 0, 8, 8, 7, 8, 6, 8, 5, 8, 4, 8, 3, 8, 2, 8, 1, 8, 0, 9, 9, 8, 9, 7, 9, 6, 9, 5, 9, 4, 9, 3, 9, 2, 9, 1, 9, 0]

cp's OEIS Frontend

A305615 Next term is the largest earlier term that would not create a repetition of an earlier subsequence of length 2, if such a number exists; otherwise it is the smallest nonnegative number not yet in the sequence.

Table of values

List of values

n	a(n)
0	0
1	0
2	1
3	1
4	0
5	2
6	2
7	1
8	2
9	0
10	3
11	3
12	2
13	3
14	1
15	3
16	0
17	4
18	4
19	3
20	4
21	2
22	4
23	1
24	4
25	0
26	5
27	5
28	4
29	5
30	3
31	5
32	2
33	5
34	1
35	5
36	0
37	6
38	6
39	5
40	6
41	4
42	6
43	3
44	6
45	2
46	6
47	1
48	6
49	0
50	7
51	7
52	6
53	7
54	5
55	7
56	4
57	7
58	3
59	7
60	2
61	7
62	1
63	7
64	0
65	8
66	8
67	7
68	8
69	6
70	8
71	5
72	8
73	4
74	8
75	3
76	8
77	2
78	8
79	1
80	8
81	0
82	9
83	9
84	8
85	9
86	7
87	9
88	6
89	9
90	5
91	9
92	4
93	9
94	3
95	9
96	2
97	9
98	1
99	9
100	0

n	a(n)
0	0
1	0
2	1
3	1
4	0
5	2
6	2
7	1
8	2
9	0
10	3
11	3
12	2
13	3
14	1
15	3
16	0
17	4
18	4
19	3
20	4
21	2
22	4
23	1
24	4
25	0
26	5
27	5
28	4
29	5
30	3
31	5
32	2
33	5
34	1
35	5
36	0
37	6
38	6
39	5
40	6
41	4
42	6
43	3
44	6
45	2
46	6
47	1
48	6
49	0
50	7
51	7
52	6
53	7
54	5
55	7
56	4
57	7
58	3
59	7
60	2
61	7
62	1
63	7
64	0
65	8
66	8
67	7
68	8
69	6
70	8
71	5
72	8
73	4
74	8
75	3
76	8
77	2
78	8
79	1
80	8
81	0
82	9
83	9
84	8
85	9
86	7
87	9
88	6
89	9
90	5
91	9
92	4
93	9
94	3
95	9
96	2
97	9
98	1
99	9
100	0

n	a(n)
0	0
1	0
2	1
3	1
4	0
5	2
6	2
7	1
8	2
9	0
10	3
11	3
12	2
13	3
14	1
15	3
16	0
17	4
18	4
19	3
20	4
21	2
22	4
23	1
24	4
25	0
26	5
27	5
28	4
29	5
30	3
31	5
32	2
33	5
34	1
35	5
36	0
37	6
38	6
39	5
40	6
41	4
42	6
43	3
44	6
45	2
46	6
47	1
48	6
49	0
50	7
51	7
52	6
53	7
54	5
55	7
56	4
57	7
58	3
59	7
60	2
61	7
62	1
63	7
64	0
65	8
66	8
67	7
68	8
69	6
70	8
71	5
72	8
73	4
74	8
75	3
76	8
77	2
78	8
79	1
80	8
81	0
82	9
83	9
84	8
85	9
86	7
87	9
88	6
89	9
90	5
91	9
92	4
93	9
94	3
95	9
96	2
97	9
98	1
99	9
100	0