A243931 - OEIS

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A243931 as a simple table

n	a(n)
1	1
2	1
3	2
4	4
5	10
6	31
7	120
8	594
9	4013
10	35092
11	428080
12	6851545
13	153025576
14	4535778875
15	187380634539
16	10385121165057
17	801710433900516

[1,1,2,4,10,31,120,594,4013,35092,428080,6851545, 153025576,4535778875,187380634539,10385121165057, 801710433900516]