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A120105 Number triangle T(n,k) = lcm(1,..,2*n+2)/lcm(1,..,2*k+2).

Table of values

n a(n)
0 1
1 6
2 1
3 30
4 5
5 1
6 420
7 70
8 14
9 1
10 1260
11 210
12 42
13 3
14 1
15 13860
16 2310
17 462
18 33
19 11
20 1
21 180180
22 30030
23 6006
24 429
25 143
26 13
27 1
28 360360
29 60060
30 12012
31 858
32 286
33 26
34 2
35 1
36 6126120
37 1021020
38 204204
39 14586
40 4862
41 442
42 34
43 17
44 1
45 116396280
46 19399380
47 3879876
48 277134
49 92378
50 8398
51 646
52 323
53 19
54 1

List of values

[1, 6, 1, 30, 5, 1, 420, 70, 14, 1, 1260, 210, 42, 3, 1, 13860, 2310, 462, 33, 11, 1, 180180, 30030, 6006, 429, 143, 13, 1, 360360, 60060, 12012, 858, 286, 26, 2, 1, 6126120, 1021020, 204204, 14586, 4862, 442, 34, 17, 1, 116396280, 19399380, 3879876, 277134, 92378, 8398, 646, 323, 19, 1]