A147470 - OEIS

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A147470 as a simple table

n	a(n)
1	1
2	1
3	1
4	3
5	5
6	9
7	19
8	55
9	245
10	1021
11	4107
12	20679
13	138093
14	1077295
15	9543083
16	95957809
17	1121795793
18	15620825665
19	256368054863
20	4898555273539
21	109719649027999
22	2878513446258779
23	87946594793312351

[1,1,1,3,5,9,19,55,245,1021,4107,20679,138093, 1077295,9543083,95957809,1121795793,15620825665, 256368054863,4898555273539,109719649027999, 2878513446258779,87946594793312351]