A338804 - cp's OEIS frontend

A338804 A sequence containing each nonnegative integer exactly twice, such that for all k, k numbers appear in the sequence between the first and second appearances of k.

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

[0, 0, 3, 1, 2, 1, 3, 2, 9, 10, 11, 12, 4, 5, 6, 7, 8, 4, 9, 5, 10, 6, 11, 7, 12, 8, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 13, 27, 14, 28, 15, 29, 16, 30, 17, 31, 18, 32, 19, 33, 20, 34, 21, 35, 22, 36, 23, 37, 24, 38, 25, 39, 26]

cp's OEIS Frontend

A338804 A sequence containing each nonnegative integer exactly twice, such that for all k, k numbers appear in the sequence between the first and second appearances of k.

Table of values

List of values

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

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

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