A238958 - cp's OEIS frontend

A238958 The number of nodes at odd level in divisor lattice in graded colexicographic 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	8
23	10
24	12
25	13
26	16
27	18
28	24
29	32
30	4
31	7
32	9
33	10
34	12
35	15
36	16
37	18
38	20
39	24
40	27
41	32
42	36
43	48
44	64
45	4
46	8
47	10
48	12
49	12
50	14
51	18
52	20
53	22
54	24
55	24
56	30
57	32
58	36
59	40
60	40
61	48
62	54
63	64
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, 8, 10, 12, 13, 16, 18, 24, 32, 4, 7, 9, 10, 12, 15, 16, 18, 20, 24, 27, 32, 36, 48, 64, 4, 8, 10, 12, 12, 14, 18, 20, 22, 24, 24, 30, 32, 36, 40, 40, 48, 54, 64, 72, 96, 128]

cp's OEIS Frontend

A238958 The number of nodes at odd level in divisor lattice in graded colexicographic 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	8
23	10
24	12
25	13
26	16
27	18
28	24
29	32
30	4
31	7
32	9
33	10
34	12
35	15
36	16
37	18
38	20
39	24
40	27
41	32
42	36
43	48
44	64
45	4
46	8
47	10
48	12
49	12
50	14
51	18
52	20
53	22
54	24
55	24
56	30
57	32
58	36
59	40
60	40
61	48
62	54
63	64
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	8
23	10
24	12
25	13
26	16
27	18
28	24
29	32
30	4
31	7
32	9
33	10
34	12
35	15
36	16
37	18
38	20
39	24
40	27
41	32
42	36
43	48
44	64
45	4
46	8
47	10
48	12
49	12
50	14
51	18
52	20
53	22
54	24
55	24
56	30
57	32
58	36
59	40
60	40
61	48
62	54
63	64
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	8
23	10
24	12
25	13
26	16
27	18
28	24
29	32
30	4
31	7
32	9
33	10
34	12
35	15
36	16
37	18
38	20
39	24
40	27
41	32
42	36
43	48
44	64
45	4
46	8
47	10
48	12
49	12
50	14
51	18
52	20
53	22
54	24
55	24
56	30
57	32
58	36
59	40
60	40
61	48
62	54
63	64
64	72
65	96
66	128