A284523 - cp's OEIS frontend

A284523 a(1) = a(2) = 1, a(3) = 2; a(n) = a(a(n-1)-1) + a(n-a(n-3)-1) for n > 3.

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

[1, 1, 2, 2, 3, 3, 3, 3, 4, 5, 5, 5, 5, 5, 6, 8, 8, 8, 8, 8, 8, 8, 8, 9, 11, 13, 13, 13, 11, 13, 13, 13, 13, 13, 13, 13, 13, 14, 16, 19, 21, 19, 16, 14, 16, 17, 21, 21, 21, 21, 19, 21, 21, 21, 21, 21, 21, 21, 21, 22, 24, 27, 32, 29, 26, 24, 21, 29, 27, 34, 34, 27, 27, 29, 34, 34, 34, 29, 27, 29, 32]

cp's OEIS Frontend

A284523 a(1) = a(2) = 1, a(3) = 2; a(n) = a(a(n-1)-1) + a(n-a(n-3)-1) for n > 3.

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

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

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