A005350 - cp's OEIS frontend

A005350 a(1) = a(2) = a(3) = 1, a(n) = a(a(n-1)) + a(n-a(n-1)) for n >= 4.

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

[1, 1, 1, 2, 2, 3, 3, 3, 4, 5, 5, 5, 5, 6, 7, 7, 8, 8, 8, 8, 8, 9, 10, 11, 11, 12, 12, 12, 13, 13, 13, 13, 13, 13, 14, 15, 16, 16, 17, 18, 18, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 22, 23, 24, 25, 25, 26, 27, 27, 28]

cp's OEIS Frontend

A005350 a(1) = a(2) = a(3) = 1, a(n) = a(a(n-1)) + a(n-a(n-1)) for n >= 4.

Table of values

List of values

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

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

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