A320435 - cp's OEIS frontend

A320435 Regular triangle read by rows where T(n,k) is the number of relatively prime k-subsets of {1,...,n}, 1 <= k <= n.

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	5
9	4
10	1
11	1
12	9
13	10
14	5
15	1
16	1
17	11
18	19
19	15
20	6
21	1
22	1
23	17
24	34
25	35
26	21
27	7
28	1
29	1
30	21
31	52
32	69
33	56
34	28
35	8
36	1
37	1
38	27
39	79
40	125
41	126
42	84
43	36
44	9
45	1
46	1
47	31
48	109
49	205
50	251
51	210
52	120
53	45
54	10
55	1
56	1
57	41
58	154
59	325
60	461
61	462
62	330
63	165
64	55
65	11
66	1
67	1
68	45
69	196

[1, 1, 1, 1, 3, 1, 1, 5, 4, 1, 1, 9, 10, 5, 1, 1, 11, 19, 15, 6, 1, 1, 17, 34, 35, 21, 7, 1, 1, 21, 52, 69, 56, 28, 8, 1, 1, 27, 79, 125, 126, 84, 36, 9, 1, 1, 31, 109, 205, 251, 210, 120, 45, 10, 1, 1, 41, 154, 325, 461, 462, 330, 165, 55, 11, 1, 1, 45, 196]

cp's OEIS Frontend

A320435 Regular triangle read by rows where T(n,k) is the number of relatively prime k-subsets of {1,...,n}, 1 <= k <= n.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	5
9	4
10	1
11	1
12	9
13	10
14	5
15	1
16	1
17	11
18	19
19	15
20	6
21	1
22	1
23	17
24	34
25	35
26	21
27	7
28	1
29	1
30	21
31	52
32	69
33	56
34	28
35	8
36	1
37	1
38	27
39	79
40	125
41	126
42	84
43	36
44	9
45	1
46	1
47	31
48	109
49	205
50	251
51	210
52	120
53	45
54	10
55	1
56	1
57	41
58	154
59	325
60	461
61	462
62	330
63	165
64	55
65	11
66	1
67	1
68	45
69	196

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	5
9	4
10	1
11	1
12	9
13	10
14	5
15	1
16	1
17	11
18	19
19	15
20	6
21	1
22	1
23	17
24	34
25	35
26	21
27	7
28	1
29	1
30	21
31	52
32	69
33	56
34	28
35	8
36	1
37	1
38	27
39	79
40	125
41	126
42	84
43	36
44	9
45	1
46	1
47	31
48	109
49	205
50	251
51	210
52	120
53	45
54	10
55	1
56	1
57	41
58	154
59	325
60	461
61	462
62	330
63	165
64	55
65	11
66	1
67	1
68	45
69	196

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	5
9	4
10	1
11	1
12	9
13	10
14	5
15	1
16	1
17	11
18	19
19	15
20	6
21	1
22	1
23	17
24	34
25	35
26	21
27	7
28	1
29	1
30	21
31	52
32	69
33	56
34	28
35	8
36	1
37	1
38	27
39	79
40	125
41	126
42	84
43	36
44	9
45	1
46	1
47	31
48	109
49	205
50	251
51	210
52	120
53	45
54	10
55	1
56	1
57	41
58	154
59	325
60	461
61	462
62	330
63	165
64	55
65	11
66	1
67	1
68	45
69	196