A328294 - cp's OEIS frontend

A328294 Set a(1)=1 and a(2)=2. For n > 2, if a(n) had already appeared in the sequence, then a(n+1) = number of steps since its most recent appearance, as in Van Eck's sequence A181391. If a(n) had not appeared before, search instead for a(n)-1, then a(n)-2, etc., until you find a number that has appeared before.

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

[1, 2, 1, 2, 2, 1, 3, 2, 3, 2, 2, 1, 6, 4, 5, 1, 4, 3, 9, 6, 7, 1, 6, 3, 6, 2, 15, 8, 7, 8, 2, 5, 17, 6, 9, 16, 9, 2, 7, 10, 3, 17, 9, 6, 10, 5, 14, 2, 10, 4, 33, 9, 9, 1, 32, 13, 7, 18, 16, 23, 2, 13, 6, 19, 6, 2, 5, 21, 4, 19, 6, 6, 1, 19, 4, 6, 4, 2, 12, 30]

cp's OEIS Frontend

Table of values

List of values

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

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

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