A191294 - OEIS

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A191294 as a simple table

n	a(n)
1	1
2	1
3	3
4	7
5	21
6	122
7	880
8	6953
9	72647
10	1129137
11	24364420
12	694152879
13	24831611879
14	1208655194306
15	80157177796753
16	7105061448777651

[1,1,3,7,21,122,880,6953,72647,1129137,24364420, 694152879,24831611879,1208655194306, 80157177796753,7105061448777651]