A383421 - cp's OEIS frontend

A383421 a(1)=1; thereafter if a(n-1) is a first occurrence, then a(n) is the number of values that occur exactly once in the sequence thus far. Otherwise; a(n) is the number of terms that are the same distance away from an earlier equal value as a(n-1) is from its previous last occurrence.

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

[1, 1, 1, 2, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 4, 5, 1, 3, 6, 2, 5, 4, 6, 7, 1, 2, 2, 3, 2, 4, 3, 6, 5, 2, 5, 5, 4, 9, 2, 6, 5, 7, 3, 4, 10, 2, 11, 3, 8, 4, 4, 5, 5, 6, 9, 10, 6, 8, 6, 6, 7, 7, 8, 10, 7, 10, 7, 8, 12, 2, 3, 5, 10, 13, 3, 9, 8, 8, 9, 11, 5, 9, 12, 12]

cp's OEIS Frontend

A383421 a(1)=1; thereafter if a(n-1) is a first occurrence, then a(n) is the number of values that occur exactly once in the sequence thus far. Otherwise; a(n) is the number of terms that are the same distance away from an earlier equal value as a(n-1) is from its previous last occurrence.

Table of values

List of values

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

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

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