A027642-OEIS公司

A027642美元作为一个简单的表

n个	a（n）
0	1
1	2
2	6
三	1
4	30
5	1
6	42
7	1
8	30
9	1
10	66
11	1
12	2730
13	1
14	6
15	1
16	510
17	1
18	798
19	1
20	330
21	1
22	138
23	1
24	2730
25	1
26	6
27	1
28	870
29	1
30	14322
31	1
32	510
33	1
34	6
35	1
36	1919190
37	1
38	6
39	1
40	13530
41	1
42	1806
43	1
44	690
45	1
46	282
47	1
48	46410
49	1
50	66
51	1
52	1590
53	1
54	798
55	1
56	870
57	1
58	354
59	1
60	56786730
61	1

[1,2,6,1,30,1,42,1,30,1,66,1,2730,1,6,1,510,1,798,1,330,1,138,1,2730,1,6,1,870,1,14322,1,510,1,6,1,1919190,1,6,1,13530,1,1806,1,690,1,282,1,46410,1,66,1,1590,1,798,1,870,1,354,1,56786730,1]