A163641 - OEIS

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A163641 as a simple table

n	a(n)
0	1
1	1
2	2
3	6
4	6
5	30
6	10
7	70
8	70
9	210
10	42
11	462
12	462
13	6006
14	858
15	4290
16	4290
17	72930
18	24310
19	461890
20	92378
21	1939938
22	176358
23	4056234
24	1352078
25	6760390
26	520030
27	1560090
28	222870
29	6463230
30	6463230
31	200360130

[1,1,2,6,6,30,10,70,70,210,42,462,462,6006,858, 4290,4290,72930,24310,461890,92378,1939938,176358, 4056234,1352078,6760390,520030,1560090,222870, 6463230,6463230,200360130]