A377278 - OEIS

A377278 as a simple table

n	a(n)
1	1
2	3
3	3
4	3
5	21
6	7
7	3
8	21
9	105
10	15
11	3
12	21
13	105
14	465
15	31
16	3
17	21
18	105
19	465
20	1953
21	63
22	3
23	21
24	105
25	465
26	1953
27	8001
28	127
29	3
30	21
31	105
32	465
33	1953
34	8001
35	32385
36	255
37	3
38	21
39	105
40	465
41	1953
42	8001
43	32385
44	130305
45	511
46	3
47	21
48	105
49	465
50	1953
51	8001
52	32385
53	130305
54	522753
55	1023

[1,3,3,3,21,7,3,21,105,15,3,21,105,465,31,3,21, 105,465,1953,63,3,21,105,465,1953,8001,127,3,21, 105,465,1953,8001,32385,255,3,21,105,465,1953, 8001,32385,130305,511,3,21,105,465,1953,8001, 32385,130305,522753,1023]