A358503 - cp's OEIS frontend

A358503 Positions inventory sequence: for stage k >= 2 we record where all the numbers from the two previous stages have appeared, starting with a(0) = 0, a(1) = 0.

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

[0, 0, 0, 1, 1, 2, 3, 2, 3, 4, 5, 6, 4, 5, 7, 6, 8, 9, 10, 11, 7, 8, 9, 12, 10, 13, 11, 15, 14, 16, 17, 18, 19, 12, 13, 15, 14, 20, 16, 21, 17, 22, 18, 24, 19, 26, 23, 25, 28, 27, 29, 30, 31, 32, 20, 21, 22, 24, 26, 23, 33, 25, 34, 28, 36, 27, 35, 29, 38, 30, 40, 31, 42]

cp's OEIS Frontend

A358503 Positions inventory sequence: for stage k >= 2 we record where all the numbers from the two previous stages have appeared, starting with a(0) = 0, a(1) = 0.

Table of values

List of values

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

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

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