A093430 - cp's OEIS frontend

A093430 Triangle read by rows: T(n,k) = lcm(n, n-1, ..., n-k+2, n-k+1)/lcm(1, 2, ..., k) (1 <= k <= n).

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

[1, 2, 1, 3, 3, 1, 4, 6, 2, 1, 5, 10, 10, 5, 1, 6, 15, 10, 5, 1, 1, 7, 21, 35, 35, 7, 7, 1, 8, 28, 28, 70, 14, 14, 2, 1, 9, 36, 84, 42, 42, 42, 6, 3, 1, 10, 45, 60, 210, 42, 42, 6, 3, 1, 1, 11, 55, 165, 330, 462, 462, 66, 33, 11, 11, 1, 12, 66, 110, 165, 66, 462, 66, 33, 11, 11, 1, 1, 13]

cp's OEIS Frontend

A093430 Triangle read by rows: T(n,k) = lcm(n, n-1, ..., n-k+2, n-k+1)/lcm(1, 2, ..., k) (1 <= k <= n).

Table of values

List of values

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

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

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