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A220167
as a simple table
n
a(n)
1
3
2
6
3
22
4
76
5
247
6
848
7
2892
8
9969
9
34455
10
119894
11
420582
12
1482874
13
5254954
14
18714432
15
66969859
16
240739417
[3,6,22,76,247,848,2892,9969,34455,119894,420582, 1482874,5254954,18714432,66969859,240739417]