A186974 - cp's OEIS frontend

A186974 Irregular triangle T(n,k), n>=1, 1<=k<=A036234(n), read by rows: T(n,k) is the number of k-element subsets of {1, 2, ..., n} having pairwise coprime elements.

n	a(n)
1	1
2	2
3	1
4	3
5	3
6	1
7	4
8	5
9	2
10	5
11	9
12	7
13	2
14	6
15	11
16	8
17	2
18	7
19	17
20	19
21	10
22	2
23	8
24	21
25	25
26	14
27	3
28	9
29	27
30	37
31	24
32	6
33	10
34	31
35	42
36	26
37	6
38	11
39	41
40	73
41	68
42	32
43	6
44	12
45	45
46	79
47	72
48	33
49	6
50	13
51	57
52	124
53	151
54	105
55	39
56	6
57	14
58	63
59	138
60	167
61	114
62	41
63	6
64	15
65	71
66	159
67	192
68	128
69	44
70	6

[1, 2, 1, 3, 3, 1, 4, 5, 2, 5, 9, 7, 2, 6, 11, 8, 2, 7, 17, 19, 10, 2, 8, 21, 25, 14, 3, 9, 27, 37, 24, 6, 10, 31, 42, 26, 6, 11, 41, 73, 68, 32, 6, 12, 45, 79, 72, 33, 6, 13, 57, 124, 151, 105, 39, 6, 14, 63, 138, 167, 114, 41, 6, 15, 71, 159, 192, 128, 44, 6]

cp's OEIS Frontend

A186974 Irregular triangle T(n,k), n>=1, 1<=k<=A036234(n), read by rows: T(n,k) is the number of k-element subsets of {1, 2, ..., n} having pairwise coprime elements.

Table of values

List of values

n	a(n)
1	1
2	2
3	1
4	3
5	3
6	1
7	4
8	5
9	2
10	5
11	9
12	7
13	2
14	6
15	11
16	8
17	2
18	7
19	17
20	19
21	10
22	2
23	8
24	21
25	25
26	14
27	3
28	9
29	27
30	37
31	24
32	6
33	10
34	31
35	42
36	26
37	6
38	11
39	41
40	73
41	68
42	32
43	6
44	12
45	45
46	79
47	72
48	33
49	6
50	13
51	57
52	124
53	151
54	105
55	39
56	6
57	14
58	63
59	138
60	167
61	114
62	41
63	6
64	15
65	71
66	159
67	192
68	128
69	44
70	6

n	a(n)
1	1
2	2
3	1
4	3
5	3
6	1
7	4
8	5
9	2
10	5
11	9
12	7
13	2
14	6
15	11
16	8
17	2
18	7
19	17
20	19
21	10
22	2
23	8
24	21
25	25
26	14
27	3
28	9
29	27
30	37
31	24
32	6
33	10
34	31
35	42
36	26
37	6
38	11
39	41
40	73
41	68
42	32
43	6
44	12
45	45
46	79
47	72
48	33
49	6
50	13
51	57
52	124
53	151
54	105
55	39
56	6
57	14
58	63
59	138
60	167
61	114
62	41
63	6
64	15
65	71
66	159
67	192
68	128
69	44
70	6

n	a(n)
1	1
2	2
3	1
4	3
5	3
6	1
7	4
8	5
9	2
10	5
11	9
12	7
13	2
14	6
15	11
16	8
17	2
18	7
19	17
20	19
21	10
22	2
23	8
24	21
25	25
26	14
27	3
28	9
29	27
30	37
31	24
32	6
33	10
34	31
35	42
36	26
37	6
38	11
39	41
40	73
41	68
42	32
43	6
44	12
45	45
46	79
47	72
48	33
49	6
50	13
51	57
52	124
53	151
54	105
55	39
56	6
57	14
58	63
59	138
60	167
61	114
62	41
63	6
64	15
65	71
66	159
67	192
68	128
69	44
70	6