A238971 - cp's OEIS frontend

A238971 The number of nodes at odd level in divisor lattice in canonical order.

n	a(n)
0	0
1	1
2	1
3	2
4	2
5	3
6	4
7	2
8	4
9	4
10	6
11	8
12	3
13	5
14	6
15	8
16	9
17	12
18	16
19	3
20	6
21	7
22	10
23	8
24	12
25	16
26	13
27	18
28	24
29	32
30	4
31	7
32	9
33	12
34	10
35	15
36	20
37	16
38	18
39	24
40	32
41	27
42	36
43	48
44	64
45	4
46	8
47	10
48	14
49	12
50	18
51	24
52	12
53	20
54	22
55	30
56	40
57	24
58	32
59	36
60	48
61	64
62	40
63	54
64	72
65	96
66	128

[0, 1, 1, 2, 2, 3, 4, 2, 4, 4, 6, 8, 3, 5, 6, 8, 9, 12, 16, 3, 6, 7, 10, 8, 12, 16, 13, 18, 24, 32, 4, 7, 9, 12, 10, 15, 20, 16, 18, 24, 32, 27, 36, 48, 64, 4, 8, 10, 14, 12, 18, 24, 12, 20, 22, 30, 40, 24, 32, 36, 48, 64, 40, 54, 72, 96, 128]

cp's OEIS Frontend

A238971 The number of nodes at odd level in divisor lattice in canonical order.

Table of values

List of values

n	a(n)
0	0
1	1
2	1
3	2
4	2
5	3
6	4
7	2
8	4
9	4
10	6
11	8
12	3
13	5
14	6
15	8
16	9
17	12
18	16
19	3
20	6
21	7
22	10
23	8
24	12
25	16
26	13
27	18
28	24
29	32
30	4
31	7
32	9
33	12
34	10
35	15
36	20
37	16
38	18
39	24
40	32
41	27
42	36
43	48
44	64
45	4
46	8
47	10
48	14
49	12
50	18
51	24
52	12
53	20
54	22
55	30
56	40
57	24
58	32
59	36
60	48
61	64
62	40
63	54
64	72
65	96
66	128

n	a(n)
0	0
1	1
2	1
3	2
4	2
5	3
6	4
7	2
8	4
9	4
10	6
11	8
12	3
13	5
14	6
15	8
16	9
17	12
18	16
19	3
20	6
21	7
22	10
23	8
24	12
25	16
26	13
27	18
28	24
29	32
30	4
31	7
32	9
33	12
34	10
35	15
36	20
37	16
38	18
39	24
40	32
41	27
42	36
43	48
44	64
45	4
46	8
47	10
48	14
49	12
50	18
51	24
52	12
53	20
54	22
55	30
56	40
57	24
58	32
59	36
60	48
61	64
62	40
63	54
64	72
65	96
66	128

n	a(n)
0	0
1	1
2	1
3	2
4	2
5	3
6	4
7	2
8	4
9	4
10	6
11	8
12	3
13	5
14	6
15	8
16	9
17	12
18	16
19	3
20	6
21	7
22	10
23	8
24	12
25	16
26	13
27	18
28	24
29	32
30	4
31	7
32	9
33	12
34	10
35	15
36	20
37	16
38	18
39	24
40	32
41	27
42	36
43	48
44	64
45	4
46	8
47	10
48	14
49	12
50	18
51	24
52	12
53	20
54	22
55	30
56	40
57	24
58	32
59	36
60	48
61	64
62	40
63	54
64	72
65	96
66	128