A285509 - cp's OEIS frontend

A285509 a(1) = 1; a(2) = a(3) = a(4) = 2; a(n) = a(a(n-1)-1) + a(n-a(n-3)) for n > 4.

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

[1, 2, 2, 2, 3, 4, 5, 5, 5, 5, 6, 8, 10, 10, 10, 9, 10, 10, 10, 10, 11, 13, 18, 20, 18, 15, 15, 15, 20, 20, 19, 18, 20, 20, 20, 19, 20, 20, 20, 20, 21, 23, 31, 38, 33, 28, 20, 20, 21, 30, 39, 39, 38, 30, 29, 25, 35, 40, 40, 38, 31, 33, 36, 40, 38, 40, 35, 40, 40, 40, 39, 38, 40, 40, 40, 39, 40, 40, 40, 40, 41, 43, 54, 69]

cp's OEIS Frontend

A285509 a(1) = 1; a(2) = a(3) = a(4) = 2; a(n) = a(a(n-1)-1) + a(n-a(n-3)) for n > 4.

Table of values

List of values

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

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

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