A080382 - cp's OEIS frontend

A080382 Triangle read by rows: T(n,k) = C(n,floor(n/2))/gcd(C(n,floor(n/2)),C(n,k)), k=0..n; central binomial coefficient is divided by greatest common divisor of binomial coefficients and corresponding central binomial coefficient.

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	2
7	3
8	1
9	1
10	3
11	6
12	3
13	1
14	3
15	6
16	10
17	2
18	1
19	1
20	2
21	10
22	20
23	10
24	4
25	1
26	4
27	10
28	20
29	35
30	5
31	5
32	1
33	1
34	5
35	5
36	35
37	70
38	35
39	5
40	5
41	1
42	5
43	5
44	35
45	70
46	126
47	14
48	7
49	3
50	1
51	1
52	3
53	7
54	14
55	126
56	252
57	126
58	28
59	21
60	6
61	1
62	6
63	21
64	28
65	126
66	252
67	462
68	42
69	42
70	14
71	7
72	1
73	1
74	7
75	14
76	42
77	42
78	462
79	924
80	77
81	14
82	21
83	28

[1, 1, 1, 2, 1, 2, 3, 1, 1, 3, 6, 3, 1, 3, 6, 10, 2, 1, 1, 2, 10, 20, 10, 4, 1, 4, 10, 20, 35, 5, 5, 1, 1, 5, 5, 35, 70, 35, 5, 5, 1, 5, 5, 35, 70, 126, 14, 7, 3, 1, 1, 3, 7, 14, 126, 252, 126, 28, 21, 6, 1, 6, 21, 28, 126, 252, 462, 42, 42, 14, 7, 1, 1, 7, 14, 42, 42, 462, 924, 77, 14, 21, 28]

cp's OEIS Frontend

A080382 Triangle read by rows: T(n,k) = C(n,floor(n/2))/gcd(C(n,floor(n/2)),C(n,k)), k=0..n; central binomial coefficient is divided by greatest common divisor of binomial coefficients and corresponding central binomial coefficient.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	2
7	3
8	1
9	1
10	3
11	6
12	3
13	1
14	3
15	6
16	10
17	2
18	1
19	1
20	2
21	10
22	20
23	10
24	4
25	1
26	4
27	10
28	20
29	35
30	5
31	5
32	1
33	1
34	5
35	5
36	35
37	70
38	35
39	5
40	5
41	1
42	5
43	5
44	35
45	70
46	126
47	14
48	7
49	3
50	1
51	1
52	3
53	7
54	14
55	126
56	252
57	126
58	28
59	21
60	6
61	1
62	6
63	21
64	28
65	126
66	252
67	462
68	42
69	42
70	14
71	7
72	1
73	1
74	7
75	14
76	42
77	42
78	462
79	924
80	77
81	14
82	21
83	28

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	2
7	3
8	1
9	1
10	3
11	6
12	3
13	1
14	3
15	6
16	10
17	2
18	1
19	1
20	2
21	10
22	20
23	10
24	4
25	1
26	4
27	10
28	20
29	35
30	5
31	5
32	1
33	1
34	5
35	5
36	35
37	70
38	35
39	5
40	5
41	1
42	5
43	5
44	35
45	70
46	126
47	14
48	7
49	3
50	1
51	1
52	3
53	7
54	14
55	126
56	252
57	126
58	28
59	21
60	6
61	1
62	6
63	21
64	28
65	126
66	252
67	462
68	42
69	42
70	14
71	7
72	1
73	1
74	7
75	14
76	42
77	42
78	462
79	924
80	77
81	14
82	21
83	28

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	2
7	3
8	1
9	1
10	3
11	6
12	3
13	1
14	3
15	6
16	10
17	2
18	1
19	1
20	2
21	10
22	20
23	10
24	4
25	1
26	4
27	10
28	20
29	35
30	5
31	5
32	1
33	1
34	5
35	5
36	35
37	70
38	35
39	5
40	5
41	1
42	5
43	5
44	35
45	70
46	126
47	14
48	7
49	3
50	1
51	1
52	3
53	7
54	14
55	126
56	252
57	126
58	28
59	21
60	6
61	1
62	6
63	21
64	28
65	126
66	252
67	462
68	42
69	42
70	14
71	7
72	1
73	1
74	7
75	14
76	42
77	42
78	462
79	924
80	77
81	14
82	21
83	28