A327883 - cp's OEIS frontend

A327883 a(0)=a(1)=0; thereafter a(n+1) is the index of the earliest as yet unused occurrence of a(n) if a(n) has occurred before; otherwise a(n+1) = a(a(n)-1). Once an occurrence of a(n) has been used it cannot be used again.

n	a(n)
0	0
1	0
2	0
3	1
4	0
5	2
6	0
7	4
8	1
9	3
10	0
11	6
12	2
13	5
14	0
15	10
16	3
17	9
18	1
19	8
20	4
21	7
22	0
23	14
24	5
25	13
26	2
27	12
28	6
29	11
30	0
31	22
32	7
33	21
34	4
35	20
36	8
37	19
38	1
39	18
40	9
41	17
42	3
43	16
44	10
45	15
46	0
47	30
48	11
49	29
50	6
51	28
52	12
53	27
54	2
55	26
56	13
57	25
58	5
59	24
60	14
61	23
62	0
63	46
64	15
65	45
66	10
67	44
68	16
69	43
70	3
71	42
72	17
73	41
74	9
75	40
76	18
77	39
78	1
79	38
80	19
81	37
82	8

[0, 0, 0, 1, 0, 2, 0, 4, 1, 3, 0, 6, 2, 5, 0, 10, 3, 9, 1, 8, 4, 7, 0, 14, 5, 13, 2, 12, 6, 11, 0, 22, 7, 21, 4, 20, 8, 19, 1, 18, 9, 17, 3, 16, 10, 15, 0, 30, 11, 29, 6, 28, 12, 27, 2, 26, 13, 25, 5, 24, 14, 23, 0, 46, 15, 45, 10, 44, 16, 43, 3, 42, 17, 41, 9, 40, 18, 39, 1, 38, 19, 37, 8]

cp's OEIS Frontend

A327883 a(0)=a(1)=0; thereafter a(n+1) is the index of the earliest as yet unused occurrence of a(n) if a(n) has occurred before; otherwise a(n+1) = a(a(n)-1). Once an occurrence of a(n) has been used it cannot be used again.

Table of values

List of values

n	a(n)
0	0
1	0
2	0
3	1
4	0
5	2
6	0
7	4
8	1
9	3
10	0
11	6
12	2
13	5
14	0
15	10
16	3
17	9
18	1
19	8
20	4
21	7
22	0
23	14
24	5
25	13
26	2
27	12
28	6
29	11
30	0
31	22
32	7
33	21
34	4
35	20
36	8
37	19
38	1
39	18
40	9
41	17
42	3
43	16
44	10
45	15
46	0
47	30
48	11
49	29
50	6
51	28
52	12
53	27
54	2
55	26
56	13
57	25
58	5
59	24
60	14
61	23
62	0
63	46
64	15
65	45
66	10
67	44
68	16
69	43
70	3
71	42
72	17
73	41
74	9
75	40
76	18
77	39
78	1
79	38
80	19
81	37
82	8

n	a(n)
0	0
1	0
2	0
3	1
4	0
5	2
6	0
7	4
8	1
9	3
10	0
11	6
12	2
13	5
14	0
15	10
16	3
17	9
18	1
19	8
20	4
21	7
22	0
23	14
24	5
25	13
26	2
27	12
28	6
29	11
30	0
31	22
32	7
33	21
34	4
35	20
36	8
37	19
38	1
39	18
40	9
41	17
42	3
43	16
44	10
45	15
46	0
47	30
48	11
49	29
50	6
51	28
52	12
53	27
54	2
55	26
56	13
57	25
58	5
59	24
60	14
61	23
62	0
63	46
64	15
65	45
66	10
67	44
68	16
69	43
70	3
71	42
72	17
73	41
74	9
75	40
76	18
77	39
78	1
79	38
80	19
81	37
82	8

n	a(n)
0	0
1	0
2	0
3	1
4	0
5	2
6	0
7	4
8	1
9	3
10	0
11	6
12	2
13	5
14	0
15	10
16	3
17	9
18	1
19	8
20	4
21	7
22	0
23	14
24	5
25	13
26	2
27	12
28	6
29	11
30	0
31	22
32	7
33	21
34	4
35	20
36	8
37	19
38	1
39	18
40	9
41	17
42	3
43	16
44	10
45	15
46	0
47	30
48	11
49	29
50	6
51	28
52	12
53	27
54	2
55	26
56	13
57	25
58	5
59	24
60	14
61	23
62	0
63	46
64	15
65	45
66	10
67	44
68	16
69	43
70	3
71	42
72	17
73	41
74	9
75	40
76	18
77	39
78	1
79	38
80	19
81	37
82	8