A172087 - OEIS

A172087 as a simple table

n	a(n)
0	1
1	1
2	3
3	3
4	15
5	15
6	21
7	21
8	15
9	15
10	33
11	33
12	1365
13	1365
14	3
15	3
16	255
17	255
18	399
19	399
20	165
21	165
22	69
23	69
24	1365
25	1365
26	3
27	3
28	435
29	435
30	7161
31	7161
32	255
33	255
34	3
35	3
36	959595
37	959595
38	3
39	3
40	6765
41	6765
42	903
43	903
44	345
45	345
46	141
47	141

[1,1,3,3,15,15,21,21,15,15,33,33,1365,1365,3,3, 255,255,399,399,165,165,69,69,1365,1365,3,3,435, 435,7161,7161,255,255,3,3,959595,959595,3,3,6765, 6765,903,903,345,345,141,141]