A213183 - cp's OEIS frontend

A213183 Initialize a(1)=R=1. Repeat: copy the last R preceding terms to current position; increment R; do twice: append the least integer that has not appeared in the sequence yet.

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

[1, 1, 2, 3, 2, 3, 4, 5, 3, 4, 5, 6, 7, 4, 5, 6, 7, 8, 9, 5, 6, 7, 8, 9, 10, 11, 6, 7, 8, 9, 10, 11, 12, 13, 7, 8, 9, 10, 11, 12, 13, 14, 15, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 11, 12]

cp's OEIS Frontend

A213183 Initialize a(1)=R=1. Repeat: copy the last R preceding terms to current position; increment R; do twice: append the least integer that has not appeared in the sequence yet.

Table of values

List of values

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

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

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