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A279558
as a simple table
n
a(n)
0
1
1
1
2
2
3
5
4
15
5
52
6
200
7
830
8
3654
9
16869
10
80963
11
401300
12
2043610
13
10649335
14
56604706
15
306101789
16
1680515427
[1,1,2,5,15,52,200,830,3654,16869,80963,401300, 2043610,10649335,56604706,306101789,1680515427]