A050169 - cp's OEIS frontend

A050169 Triangle read by rows: T(n,k) = gcd(C(n,k), C(n,k-1)), n >= 1, 1 <= k <= n.

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	2
9	2
10	1
11	1
12	5
13	10
14	5
15	1
16	1
17	3
18	5
19	5
20	3
21	1
22	1
23	7
24	7
25	35
26	7
27	7
28	1
29	1
30	4
31	28
32	14
33	14
34	28
35	4
36	1
37	1
38	9
39	12
40	42
41	126
42	42
43	12
44	9
45	1
46	1
47	5
48	15
49	30
50	42
51	42
52	30
53	15
54	5
55	1
56	1
57	11
58	55
59	165
60	66
61	462
62	66
63	165
64	55
65	11
66	1
67	1
68	6
69	22
70	55
71	99
72	132
73	132
74	99
75	55
76	22
77	6
78	1

[1, 1, 1, 1, 3, 1, 1, 2, 2, 1, 1, 5, 10, 5, 1, 1, 3, 5, 5, 3, 1, 1, 7, 7, 35, 7, 7, 1, 1, 4, 28, 14, 14, 28, 4, 1, 1, 9, 12, 42, 126, 42, 12, 9, 1, 1, 5, 15, 30, 42, 42, 30, 15, 5, 1, 1, 11, 55, 165, 66, 462, 66, 165, 55, 11, 1, 1, 6, 22, 55, 99, 132, 132, 99, 55, 22, 6, 1]

cp's OEIS Frontend

A050169 Triangle read by rows: T(n,k) = gcd(C(n,k), C(n,k-1)), n >= 1, 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	2
9	2
10	1
11	1
12	5
13	10
14	5
15	1
16	1
17	3
18	5
19	5
20	3
21	1
22	1
23	7
24	7
25	35
26	7
27	7
28	1
29	1
30	4
31	28
32	14
33	14
34	28
35	4
36	1
37	1
38	9
39	12
40	42
41	126
42	42
43	12
44	9
45	1
46	1
47	5
48	15
49	30
50	42
51	42
52	30
53	15
54	5
55	1
56	1
57	11
58	55
59	165
60	66
61	462
62	66
63	165
64	55
65	11
66	1
67	1
68	6
69	22
70	55
71	99
72	132
73	132
74	99
75	55
76	22
77	6
78	1

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	2
9	2
10	1
11	1
12	5
13	10
14	5
15	1
16	1
17	3
18	5
19	5
20	3
21	1
22	1
23	7
24	7
25	35
26	7
27	7
28	1
29	1
30	4
31	28
32	14
33	14
34	28
35	4
36	1
37	1
38	9
39	12
40	42
41	126
42	42
43	12
44	9
45	1
46	1
47	5
48	15
49	30
50	42
51	42
52	30
53	15
54	5
55	1
56	1
57	11
58	55
59	165
60	66
61	462
62	66
63	165
64	55
65	11
66	1
67	1
68	6
69	22
70	55
71	99
72	132
73	132
74	99
75	55
76	22
77	6
78	1

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	2
9	2
10	1
11	1
12	5
13	10
14	5
15	1
16	1
17	3
18	5
19	5
20	3
21	1
22	1
23	7
24	7
25	35
26	7
27	7
28	1
29	1
30	4
31	28
32	14
33	14
34	28
35	4
36	1
37	1
38	9
39	12
40	42
41	126
42	42
43	12
44	9
45	1
46	1
47	5
48	15
49	30
50	42
51	42
52	30
53	15
54	5
55	1
56	1
57	11
58	55
59	165
60	66
61	462
62	66
63	165
64	55
65	11
66	1
67	1
68	6
69	22
70	55
71	99
72	132
73	132
74	99
75	55
76	22
77	6
78	1