A285507 - cp's OEIS frontend

A285507 a(1) = a(2) = 1, a(3) = a(4) = 2; a(n) = a(a(n-2)-1) + a(n-a(n-3)-1) for n > 4.

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

[1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 5, 5, 5, 5, 6, 6, 8, 8, 8, 8, 8, 8, 8, 9, 9, 11, 11, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 16, 16, 17, 17, 17, 17, 18, 18, 21, 21, 21, 20, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 24, 24, 24, 24, 24, 25, 25, 26, 26, 26, 26, 27, 27, 32, 32, 34, 30, 31, 29, 34, 33, 34, 34, 33, 33, 34, 34]

cp's OEIS Frontend

A285507 a(1) = a(2) = 1, a(3) = a(4) = 2; a(n) = a(a(n-2)-1) + a(n-a(n-3)-1) for n > 4.

Table of values

List of values

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

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

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