A382559 - cp's OEIS frontend

A382559 a(n) is the length of the longest subsequence at indices in arithmetic progression ending at a(n-1) whose terms form an arithmetic progression in some order; a(1)=1.

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

[1, 1, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 3, 2, 4, 3, 3, 3, 3, 4, 4, 3, 4, 3, 3, 5, 5, 4, 3, 3, 3, 5, 3, 4, 3, 4, 4, 3, 4, 3, 4, 3, 4, 4, 5, 3, 4, 3, 4, 4, 5, 3, 3, 3, 5, 4, 3, 5, 3, 4, 4, 4, 5, 3, 4, 4, 4, 3, 6, 4, 4, 4, 5, 3, 4, 6, 4, 4, 4, 4, 5, 4, 5, 3, 4, 6, 5, 4, 7]

cp's OEIS Frontend

A382559 a(n) is the length of the longest subsequence at indices in arithmetic progression ending at a(n-1) whose terms form an arithmetic progression in some order; a(1)=1.

Table of values

List of values

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

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

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