A067049 - cp's OEIS frontend

A067049 Triangle T(n,r) = lcm(n,n-1,n-2,...,n-r+1)/lcm(1,2,3,...,r-1,r), 0 <= r < n.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	3
8	3
9	1
10	1
11	4
12	6
13	2
14	1
15	1
16	5
17	10
18	10
19	5
20	1
21	1
22	6
23	15
24	10
25	5
26	1
27	1
28	1
29	7
30	21
31	35
32	35
33	7
34	7
35	1
36	1
37	8
38	28
39	28
40	70
41	14
42	14
43	2
44	1
45	1
46	9
47	36
48	84
49	42
50	42
51	42
52	6
53	3
54	1
55	1
56	10
57	45
58	60
59	210
60	42
61	42
62	6
63	3
64	1
65	1
66	1
67	11
68	55
69	165
70	330
71	462
72	462
73	66
74	33
75	11
76	11
77	1
78	1
79	12
80	66
81	110

[1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 6, 2, 1, 1, 5, 10, 10, 5, 1, 1, 6, 15, 10, 5, 1, 1, 1, 7, 21, 35, 35, 7, 7, 1, 1, 8, 28, 28, 70, 14, 14, 2, 1, 1, 9, 36, 84, 42, 42, 42, 6, 3, 1, 1, 10, 45, 60, 210, 42, 42, 6, 3, 1, 1, 1, 11, 55, 165, 330, 462, 462, 66, 33, 11, 11, 1, 1, 12, 66, 110]

cp's OEIS Frontend

A067049 Triangle T(n,r) = lcm(n,n-1,n-2,...,n-r+1)/lcm(1,2,3,...,r-1,r), 0 <= r < n.

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	3
9	1
10	1
11	4
12	6
13	2
14	1
15	1
16	5
17	10
18	10
19	5
20	1
21	1
22	6
23	15
24	10
25	5
26	1
27	1
28	1
29	7
30	21
31	35
32	35
33	7
34	7
35	1
36	1
37	8
38	28
39	28
40	70
41	14
42	14
43	2
44	1
45	1
46	9
47	36
48	84
49	42
50	42
51	42
52	6
53	3
54	1
55	1
56	10
57	45
58	60
59	210
60	42
61	42
62	6
63	3
64	1
65	1
66	1
67	11
68	55
69	165
70	330
71	462
72	462
73	66
74	33
75	11
76	11
77	1
78	1
79	12
80	66
81	110

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	3
8	3
9	1
10	1
11	4
12	6
13	2
14	1
15	1
16	5
17	10
18	10
19	5
20	1
21	1
22	6
23	15
24	10
25	5
26	1
27	1
28	1
29	7
30	21
31	35
32	35
33	7
34	7
35	1
36	1
37	8
38	28
39	28
40	70
41	14
42	14
43	2
44	1
45	1
46	9
47	36
48	84
49	42
50	42
51	42
52	6
53	3
54	1
55	1
56	10
57	45
58	60
59	210
60	42
61	42
62	6
63	3
64	1
65	1
66	1
67	11
68	55
69	165
70	330
71	462
72	462
73	66
74	33
75	11
76	11
77	1
78	1
79	12
80	66
81	110

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	3
8	3
9	1
10	1
11	4
12	6
13	2
14	1
15	1
16	5
17	10
18	10
19	5
20	1
21	1
22	6
23	15
24	10
25	5
26	1
27	1
28	1
29	7
30	21
31	35
32	35
33	7
34	7
35	1
36	1
37	8
38	28
39	28
40	70
41	14
42	14
43	2
44	1
45	1
46	9
47	36
48	84
49	42
50	42
51	42
52	6
53	3
54	1
55	1
56	10
57	45
58	60
59	210
60	42
61	42
62	6
63	3
64	1
65	1
66	1
67	11
68	55
69	165
70	330
71	462
72	462
73	66
74	33
75	11
76	11
77	1
78	1
79	12
80	66
81	110