A023996 - cp's OEIS frontend

A023996 Triangle of numbers T(n,k), where T(n,k) is the number of sets S = {a_1, a_2, ..., a_k}, with 1 < a_i < a_j <= n such that no a_j divides the product of all the others.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	3
8	2
9	1
10	4
11	5
12	2
13	1
14	5
15	7
16	3
17	1
18	6
19	12
20	10
21	3
22	1
23	7
24	16
25	15
26	5
27	1
28	8
29	22
30	24
31	9
32	1
33	9
34	28
35	34
36	14
37	1
38	10
39	37
40	62
41	48
42	14
43	1
44	11
45	43
46	74
47	58
48	17
49	1
50	12
51	54
52	117
53	132
54	75
55	17
56	1
57	13
58	64
59	151
60	182
61	108
62	25
63	1
64	14
65	75
66	184
67	224
68	132
69	30
70	1
71	15
72	86

[1, 1, 1, 1, 2, 1, 1, 3, 2, 1, 4, 5, 2, 1, 5, 7, 3, 1, 6, 12, 10, 3, 1, 7, 16, 15, 5, 1, 8, 22, 24, 9, 1, 9, 28, 34, 14, 1, 10, 37, 62, 48, 14, 1, 11, 43, 74, 58, 17, 1, 12, 54, 117, 132, 75, 17, 1, 13, 64, 151, 182, 108, 25, 1, 14, 75, 184, 224, 132, 30, 1, 15, 86]

cp's OEIS Frontend

A023996 Triangle of numbers T(n,k), where T(n,k) is the number of sets S = {a_1, a_2, ..., a_k}, with 1 < a_i < a_j <= n such that no a_j divides the product of all the others.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	3
8	2
9	1
10	4
11	5
12	2
13	1
14	5
15	7
16	3
17	1
18	6
19	12
20	10
21	3
22	1
23	7
24	16
25	15
26	5
27	1
28	8
29	22
30	24
31	9
32	1
33	9
34	28
35	34
36	14
37	1
38	10
39	37
40	62
41	48
42	14
43	1
44	11
45	43
46	74
47	58
48	17
49	1
50	12
51	54
52	117
53	132
54	75
55	17
56	1
57	13
58	64
59	151
60	182
61	108
62	25
63	1
64	14
65	75
66	184
67	224
68	132
69	30
70	1
71	15
72	86

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	3
8	2
9	1
10	4
11	5
12	2
13	1
14	5
15	7
16	3
17	1
18	6
19	12
20	10
21	3
22	1
23	7
24	16
25	15
26	5
27	1
28	8
29	22
30	24
31	9
32	1
33	9
34	28
35	34
36	14
37	1
38	10
39	37
40	62
41	48
42	14
43	1
44	11
45	43
46	74
47	58
48	17
49	1
50	12
51	54
52	117
53	132
54	75
55	17
56	1
57	13
58	64
59	151
60	182
61	108
62	25
63	1
64	14
65	75
66	184
67	224
68	132
69	30
70	1
71	15
72	86

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	3
8	2
9	1
10	4
11	5
12	2
13	1
14	5
15	7
16	3
17	1
18	6
19	12
20	10
21	3
22	1
23	7
24	16
25	15
26	5
27	1
28	8
29	22
30	24
31	9
32	1
33	9
34	28
35	34
36	14
37	1
38	10
39	37
40	62
41	48
42	14
43	1
44	11
45	43
46	74
47	58
48	17
49	1
50	12
51	54
52	117
53	132
54	75
55	17
56	1
57	13
58	64
59	151
60	182
61	108
62	25
63	1
64	14
65	75
66	184
67	224
68	132
69	30
70	1
71	15
72	86