A380037 - cp's OEIS frontend

A380037 For n >= 1, if there exists an m < n such that a(m) = a(n), take the largest such m and set a(n+1) as 1 more than the number of positive terms between a(m+1) and a(n-1). Otherwise, a(n+1) = -1. Start with a(1) = 0.

n	a(n)
1	0
2	-1
3	-1
4	1
5	-1
6	2
7	-1
8	2
9	1
10	3
11	-1
12	4
13	-1
14	2
15	4
16	2
17	2
18	1
19	7
20	-1
21	7
22	1
23	3
24	10
25	-1
26	5
27	-1
28	2
29	8
30	-1
31	3
32	5
33	4
34	14
35	-1
36	5
37	3
38	5
39	2
40	9
41	-1
42	6
43	-1
44	2
45	3
46	6
47	3
48	2
49	4
50	13
51	-1
52	8
53	18
54	-1
55	3
56	6
57	8
58	4
59	7
60	30
61	-1
62	7
63	2
64	12
65	-1
66	4
67	6
68	9
69	22
70	-1
71	5
72	26

[0, -1, -1, 1, -1, 2, -1, 2, 1, 3, -1, 4, -1, 2, 4, 2, 2, 1, 7, -1, 7, 1, 3, 10, -1, 5, -1, 2, 8, -1, 3, 5, 4, 14, -1, 5, 3, 5, 2, 9, -1, 6, -1, 2, 3, 6, 3, 2, 4, 13, -1, 8, 18, -1, 3, 6, 8, 4, 7, 30, -1, 7, 2, 12, -1, 4, 6, 9, 22, -1, 5, 26]

cp's OEIS Frontend

A380037 For n >= 1, if there exists an m < n such that a(m) = a(n), take the largest such m and set a(n+1) as 1 more than the number of positive terms between a(m+1) and a(n-1). Otherwise, a(n+1) = -1. Start with a(1) = 0.

Table of values

List of values

n	a(n)
1	0
2	-1
3	-1
4	1
5	-1
6	2
7	-1
8	2
9	1
10	3
11	-1
12	4
13	-1
14	2
15	4
16	2
17	2
18	1
19	7
20	-1
21	7
22	1
23	3
24	10
25	-1
26	5
27	-1
28	2
29	8
30	-1
31	3
32	5
33	4
34	14
35	-1
36	5
37	3
38	5
39	2
40	9
41	-1
42	6
43	-1
44	2
45	3
46	6
47	3
48	2
49	4
50	13
51	-1
52	8
53	18
54	-1
55	3
56	6
57	8
58	4
59	7
60	30
61	-1
62	7
63	2
64	12
65	-1
66	4
67	6
68	9
69	22
70	-1
71	5
72	26

n	a(n)
1	0
2	-1
3	-1
4	1
5	-1
6	2
7	-1
8	2
9	1
10	3
11	-1
12	4
13	-1
14	2
15	4
16	2
17	2
18	1
19	7
20	-1
21	7
22	1
23	3
24	10
25	-1
26	5
27	-1
28	2
29	8
30	-1
31	3
32	5
33	4
34	14
35	-1
36	5
37	3
38	5
39	2
40	9
41	-1
42	6
43	-1
44	2
45	3
46	6
47	3
48	2
49	4
50	13
51	-1
52	8
53	18
54	-1
55	3
56	6
57	8
58	4
59	7
60	30
61	-1
62	7
63	2
64	12
65	-1
66	4
67	6
68	9
69	22
70	-1
71	5
72	26

n	a(n)
1	0
2	-1
3	-1
4	1
5	-1
6	2
7	-1
8	2
9	1
10	3
11	-1
12	4
13	-1
14	2
15	4
16	2
17	2
18	1
19	7
20	-1
21	7
22	1
23	3
24	10
25	-1
26	5
27	-1
28	2
29	8
30	-1
31	3
32	5
33	4
34	14
35	-1
36	5
37	3
38	5
39	2
40	9
41	-1
42	6
43	-1
44	2
45	3
46	6
47	3
48	2
49	4
50	13
51	-1
52	8
53	18
54	-1
55	3
56	6
57	8
58	4
59	7
60	30
61	-1
62	7
63	2
64	12
65	-1
66	4
67	6
68	9
69	22
70	-1
71	5
72	26