A147102 - OEIS

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A147102 as a simple table

n	a(n)
1	1
2	1
3	1
4	3
5	7
6	15
7	33
8	93
9	429
10	2069
11	10289
12	55429
13	387995
14	3482253
15	35863559
16	411870399
17	5523860439
18	89237334993
19	1723598801687
20	38814880673445
21	1022726070574065

[1,1,1,3,7,15,33,93,429,2069,10289,55429,387995, 3482253,35863559,411870399,5523860439,89237334993, 1723598801687,38814880673445,1022726070574065]